Squall line beginning to weaken...

By: Zachary Labe , 6:14 PM GMT on August 01, 2009

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"Afternoon Thoughts"(Updated 8/01)
The other day while watching the 11pm evening News after the typical headlines of the day, something on Michael Jackson, healthcare reform, etc a small blurb came on about those recycled grocery bags. It mentioned that the latest scientific study announced that large amounts of bacteria were found being transferred in our reusable grocery bags potentially spreading E Coli, etc and that juices from our raw meat would slip through the packages into the mesh grocery bag material spreading more food-born illness. At the end of the report a scientist remarked, "If you are so worried about E Coli from your grocery bag, there is something wrong." I had to clap my hands at that statement. Recently more and more of these so called "save the Earth" type products are littering stores. I even bought a new "Environmentally Friendly" pillow the other day, whatever that means. And now these CFL light bulbs that make it sound like you need to bring in a HAZMAT team every time a bulb burns out or breaks. It appears to take more energy to use and dispose of these new bulbs than the old incandescent bulb. I am a full environmental person and do my part by local litter pick-ups and planting trees and gardens, but I just feel this whole climate change has gone a bit overboard in terms of the retail market. Now local shopping centers are finding ways to have a yearlong Christmas by advertising these statements about new environmentally friendly products. Whatever happened to just planting a tree? And did anyone notice it isn't global warming anymore it is now official called climate change. I am not here to denounce the maps and data suggesting the loss of ice melt and warming land temperatures as the data is factual. My suggestion is why do we not look at other theories than just a direct human influence. How about the sun which supplies all of heat and energy here on Earth. I will not say that Humans are doing beneficial things for the planet by all of the pollution, but I do not think we are the only reason for change. Why the Earth is always going through changes and that is why climate is climate and climate is always changing especially considering long term decadal weather patterns. Also why is the data collected by NOAA for global temperature monthly reports only in a 30 year period? So being the warmest June on record globally only includes data from the last 30 years, hmmm. We are told back in elementary school about sufficient data in science fair projects and the more the merrier. Anyways I am not here to cause a climate debate as this is in no way a climate blog; in fact I really do not want to see any debate. But my thoughts are just to stir the pot and to get one thinking that maybe this climate change is just more than weather patterns changing; with roots more in politics and the consumer based economy. Anyways have a wonderful Saturday afternoon and week!!!

"Regional Advisories"

(Courtesy of NOAA)

"7-Day Forecast Discussion"(Pennsylvania, Maryland, Delaware)(Updated 8/01)
Current vapor loop shows evident surface map features across the United States with a stalled frontal boundary along the coastal plain from North Carolina on southward. Another deep trough moves in across the Great Lakes behind an advancing shortwave and dying cold front plagued to hit parts of the east during the day Sunday. Rising heights ahead of a cold front will lead rising temperatures and humidity Saturday through Sunday. Current 12z NAM seems to be handling the mesoscale features better than GFS and GEFS with 850s rising to near 15C on Sunday. Highs will be variable across the region thanks to some areas with cloud cover. Across the mountains from Garret County, Maryland on northward through Johnstown up through Bradford highs will be near 78-80 dependent on elevation. Highs for valley locations from north central Maryland up through central Pennsylvania will be in the low 80s and for major cities such as Pittsburgh and cities across Maryland up through Delaware and southern Pennsylvania highs will be in the upper 80s. Sunday early morning will feature a few scattered showers and thunderstorms over eastern areas as a disturbance rides up northeast along the boundary off the coast. Max rainfall totals should only be around .25inches and best chances of rain are from the Altoona-State College-Williamsport line on eastward. IFR conditions will persist through 10am late morning as residual moisture forms stratus over the east. Advancing cirrus over western Pennsylvania in response to an approaching cold front will allow some slight heating of the atmosphere before clouds lower and thicken. The cold front will be weakening but with a shortwave passing over the Delmarva bulk shear values will remain near 40-45knots posing the threat of severe weather across most of Maryland, Delaware, and eastern Pennsylvania. Meager thermodynamics with SBCAPE values near 1500 j/kg and minimal surface heating will prevent widespread severe weather, but still some areas may see damaging winds. Warm air aloft and freezing levels over 12000ft will prevent widespread large hail reports. Thunderstorms will generally be from central portions of the region on eastward as rain showers over western areas will preclude thunder development in the morning. Rainfall amounts up to .5inches, especially in storms, cannot be ruled out. Sunday night will feature the scattering of any leftover convection eventually completely moving off the coast by 11pm. Lows will near the mid 60s from the coastal plain west towards the Frederick, MD-State College, PA line and there, lows will be in the low 60s on westward. Relaxing pressure gradient will allow fog to form Sunday night with leftover ground moisture. Dense fog may occur across the entire region with LIFR conditions potentially widespread. Monday will feature more humid and mild conditions as the frontal boundary remains across the Delmarva. With uneven heating of the surface, thunderstorms will develop over the ridgetops across areas south of I-80 during Monday afternoon and track eastward into the valleys by dark. A few thunderstorms may also develop on the sea breezes over the Chesapeake Bay basin. Lowering PWATs near 1.5inches will prevent flash flooding and weak instability and kinematics should prevent severe weather. Highs will be mild across the region with elevations below 1000ft with highs in the upper 80s and elevations above 1000ft with highs in the low to mid 80s. Areas near Washington DC and Dover, DE may approach 90degrees. Monday night will feature clear skies and light MVFR valley fog especially over the Laurel Highlands. Lows will be in the low 60s regionwide. Tuesday will feature another cold front ahead of an upper level trough pivoting through the Great Lakes. Strong diurnal heating ahead of the cold front advancing southeast will allow temperatures to warm to near 90degrees for much of the region as H85s rise to near 18C. Tuesday will the warmest day out of the next 10days. A strong 40knot low level jet out ahead of the cold front will allow for strong winds aloft potentially reaching the surface through severe thunderstorms. Moderate SBCAPE and MUCAPE values will make damaging the winds the primary threat. Rainfall amounts will be dependent on areas that see thunderstorms, but with PWATs rising to near 1.8inches some areas could see over .5inches. Tuesday night cooler and drier air will move in preventing fog formation and allowing lows to drop into the low 60s region wide with upper 50s across northwestern Pennsylvania near Erie and Bradford.

An anomalous upper level trough will bring well below normal H85s below 10C from the Pennsylvania turnpike on northward. 1020mb high pressure will also bring very dry air over the region with dewpoints likely in the upper 50s by Wednesday. Sunshine will prevail across the region with only scattered diurnal cumulus forming over the ridgetops during the days. Highs will be several degrees below normal in the low 80s for most areas. The frontal boundary that moved through Tuesday afternoon will hang up over North Carolina on Wednesday. A shortwave will begin to move up along the front Wednesday night and Thursday for increasing chances of convection across southern Maryland and Delaware on Thursday. Lows Wednesday will be well below normal thanks to an anomalously dry airmass. Lows will be in the low 50s across the mountains with lows in the upper 50s over rural areas and valley locations. Closer to the urban areas lows will be in the low 60s. Thursday will be similar to Wednesday but with a chance of thunderstorms over extreme southern areas. Elsewhere just some scattered afternoon cumulus. Highs will be near 80 for most areas north of the PA/MD border with areas south in the mid 80s closer to the front and humidity. Rainfall amounts will be confined to southern MD and DE with totals up to .25inches. Thursday night will feature clearing skies over the region and dropping dewpoints as RH values drop to 40% for most locales. Lows in the upper 40s cannot be ruled out near Bradford, but lows in the 50s should be prevalent for most areas. Friday will be nice across the entire area as the 1020mb high pressure centers over our area and pushes the boundary to the south over the Southeast. Highs will be below normal in the upper 70s to low 80s for most areas with dry dewpoints in the 50s. Scattered afternoon cumuli are once again likely over the ridgetops. Lows Friday night will be in the upper 50s to low 60s.

By the weekend rising moisture levels as winds shift to the southwest will be prevalent as diurnal chances of thunderstorms increases from Pennsylvania on south. Conflictions arise in the long term as far as national weather patterns. Current ECMWF continues to push the idea of the ridge over the southwest shifting eastward eventually to the East which would allow warmer weather. GFS is less certain with conflicting runs between continuing the trough through mid month over the east or allowing a southeast ridge to form. I thoroughly believe in a balance in equilibrium so I think it is quite possible for a very warm period around mid month as the ridge finally leaves the western US and migrates east. I do not think it lasts long though.

"Regional Radars"

(Courtesy of Wunderground)

"Regional Satellite"

(Courtesy of Penn State Meteo.)

"Lower Susquehanna Valley Forecast"(Franklin, Adams, York, Lancaster, Cumberland, Perry, Dauphin, Lebanon Counties)(Updated 8/01)
A stalled front off the eastern seaboard will be problematic Saturday night for the Lower Susquehanna Valley as a wave of low pressures moves up along the front causing nocturnal showers and thunderstorms over the region late Saturday night. QPF totals are not overly impressive only around .25inches for some locations especially over Lancaster County. Lows will be mild as dewpoints remain high and clouds thicken over the region. Lows in Harrisburg and York will be near 70 with surrounding suburbs in the mid to upper 60s. Sunday a weakening front will approach the region. Residual moisture from any rainfall overnight will form morning low IFR stratus over the region with ceilings as low as 800ft. Early August sun should burn off the clouds by noon before more clouds move in from the west. With a few hours possible of slight breaks in the clouds for sunshine some meager surface based CAPE near 1500 j/kg will form especially over southern York County and across Lancaster County. Bulk shear levels rise to near 40knots ahead of the front potentially allowing damaging winds to form in some isolated severe thunderstorms. Thunderstorms should not be overly widespread as the front will be weak and PWATs will only be up to 1.8inches. Heavy rain cannot be ruled out though in a few cells. Generally QPF will be .25inches over the valley but amounts up to .5inches+ cannot be ruled out. Highs Sunday will be around 80-84 over the valley. Decoupling winds and high surface moisture will possibly allow dense fog to form Sunday night after skies clear. Visibilities may fall to near .15miles in areas that received rainfall and areas prone to fog such as Lancaster County south of the Mt. Gretna Mountains. Lows Sunday night will be mild in the 60s across the areas near 70 in the city of Harrisburg. Monday after some residual morning fog skies will clear, but haze will be common throughout the day with 6mile visibilities. With a dying boundary to the south of the region and semi steep lapse rates a few afternoon pulse thunderstorms cannot be ruled out. Thunderstorm development will likely be over the mountains especially over South Mountain, near Blue Mountain over Franklin Counties and over the York County Mountains towards Hanover. Rainfall amounts will be light and spotty with only a handful of small cells forming with likely little to no severe weather. Highs Monday will be mild in the mid 80s over the region up to 86 in Lancaster. Monday night will feature clearing skies with high humidity for some more valley fog not near as widespread though. Lows will be near 70 in Harrisburg, York, and Lancaster and elsewhere in the mid 60s. Tuesday will feature another cold front approaching the region from the northwest. Cirrus will be widespread over the region, but surface heating will allow CAPE values to rise near 2000 j/kg surface based over the Lower Susquehanna Valley. Precipitate waters will rise to near 1.7inches, which is near normal for convection days in the Summer. Thunderstorms will develop and move across the region and with a strong low level jet screaming near 40knots, some severe weather is possible. Highs Tuesday will be hot and near 90degrees for most areas, but upper 80s over mountains over northern Dauphin County and Perry County. Rainfall amounts will be generally near .5inches or less depending on areas of thunderstorm formation. Tuesday night will feature clearing skies along with dry air moving in preventing any fog formation except for valleys such as Fishing Creek, Stony, Clarks, and Powells. Lows will be in the low 60s over the area with upper 50s likely from Newport on Perry County on westward in the county.

Wednesday will be a delightful day over the region as a deep trough with dry air and high pressure remains parked over Pennsylvania. Cool northwest wind will keep dewpoints in the 50s north of the turnpike and low 60s on southward. Sunshine will be prevalent, but a few cumuli may form over South Mountain, Blue Mountain, and Peters Mountain. Highs will be near 80 over the valley. Wednesday night will feature dry air and clear skies allowing for ideal radiational cooling with lows dropping as low as 52 near Williamstown in northern Dauphin County. Elsewhere lows in the mid to upper 50s are likely. Thursday will be another nice day with sunshine and a few ridetop cumulus. Highs again will be near 80 with dewpoints in the 50s. Below normal temperatures will continue for the lows as they drop to near 50 in Powells Valley in Dauphin County. A good rule of thumb after a cold front with high pressure in control is the second night after the front will be the coldest. Lows elsewhere will be in the mid 50s. Friday will feature some cirrus and rising dewpoints in the 60s as the flow turns more southwesterly. Highs will be slightly warmer approaching 84 in Gettysburg and Chambersburg. An isolated thunderstorm cannot be ruled out over northern Franklin County and western Cumberland and Perry Counties close to the Blue Mountain.

"Current Lower Susquehanna Valley Radar"

(Courtesy of Wunderground)

"Chesapeake Bay and Atlantic Coast Marine and Boating Forecast"(Maryland and Delaware Coastal Forecast)(Updated 8/01)
Relatively nice week for those with activity over the waters as pressure gradients remain pretty loose keeping a hold on wind and waves. Saturday will feature high pressure over the region although some southerly winds will cause 3-5ft waves along the Atlantic coast. The rip current threat is low to moderate Saturday. A cold front will move for Sunday causing a stronger southerly flow with winds up to 20knots over the Chesapeake and Delaware Bay basins. It does appear though conditions generally will be below the small craft advisory threshold. The rip current threat along the Atlantic Coast will be moderate especially from Ocean City on southward in Maryland. Monday will feature high pressure and nice boating conditions although a few strong thunderstorms may occur causing possibly special marine warning conditions in isolated locations in the afternoon. Tuesday another cold front will move through the region, but the pressure gradient will remain loose keeping winds at less than 10knots and well below small craft advisory thresholds. Astronomical tides during this 7-day period will also be near or below normal so flooding is not expected this week even along favorable splash-over areas. Stronger thunderstorms are possible Tuesday afternoon into early evening so boaters beware for rapidly changing conditions. Wednesday will generally be a nice boating day over the region with sunshine. Thursday through Saturday a chance of thunderstorms is possible in the afternoon from Ocean City on southward and across Annapolis on southward in the Chesapeake. But generally wind and waves will remain light. Overall conditions appear to be very quiet for the next seven days.

"Current Atlantic Coast Forecast Wave Heights and Chesapeake Bay Forecast Wind Direction/Speed"

(Courtesy of NOAA)

"Agriculture/Gardening 7-Day Outlook"(Updated 8/01)
Another week of more rainfall is possible for the next seven days with several chances of rain showers and convection. Two organized chances of thunderstorms also will occur this week. Sunday a front will approach the region with showers and thunderstorms causing a widespread .25inches, but some areas could receive more up to .75inches in thunderstorms. Isolated thunderstorms are then possible Monday with more organized thunderstorms Tuesday with similar QPF to Sunday. The rest of the week dries out with low humidity towards Wednesday, Thursday, and Friday. Watering gardens only looks necessary later in the week as dewpoints dry in the 50s which is very odd for this time of year. Drought conditions are improving over southern Maryland where abnormally dry conditions were being reported. Heat will be lacking this week with only one day of widespread 90s being on Tuesday.

My garden is doing pretty well although lacking in some areas thanks to the cooler weather. If the soil dries out enough this Saturday I hope to get in some early cool weather crops. Looking at the calendar it is officially August and this is the last month in the meteorological Summer. Days are slowly shortening and the daily averages have now begun to drop from the highest point back in mid to late July. So according to gardening calendars it is time to start planting a few cool weather crops. I would like to plant some broccoli and cauliflower along with lettuce and spinach. I plan on planting these crops in part shade locations because they receive shade in the afternoon and get the morning sun. This allows them to miss some of the hot weather that can happen in August. Currently my radishes I planted which were supposed to be a Summer variety are not doing well. They just continue to grow a larger green foliage, but do not thicken the radish bulb at all. It appears they soon are going to bolt. My blueberry bushes are beginning to have the leaves turn red as the producing season is over and they loose foliage pretty early compared to everything else. The cooler weather also may have aided in their early color turn. Once again no berries. My celery is just wonderful in turning into stalks with harvest now just about any day. I just hope it is not too strong as I did not really protect it from blanching in the Sun. My leeks are growing and about the width of a half dollar coin for a majority of them. They should be able to be picked by early Fall. The Swiss Chard is growing larger, but with warmer weather comes a slightly bitter taste so I have not picked any in a while. But the leaves add a bit of color so I have kept the plants growing. My one cucumber plant has completely died along with my cilantro plant. I am not sure what happened. But this is the area I plan to put some of the Fall crops. My other cucumber plants have slowed down production. So I did a bit of a cucumber experiment and made some B&B refrigerator pickles, but for my first attempt they turned out way too spicy. Maybe too much red pepper and turmeric? I will try again next year. My zucchini have slowed down and are not producing any currently within the last two days. My roma tomato plant is doing the best and I pick a few every day. But my Early Girl and Cherry tomato plants are not ripening at all and very slow to grow. But finally I picked a few today. My Basil is growing and it is wonderful to add it to pasta dishes. My other herbs, chives, oregano, and parsley I use for any dinner dish I possibly can. I am making a batch of vinegar potato salad for dinner tonight adding some parsley. My melon plants are doing well, but I just do not know when I have to pick them. Anyone have any experience with lambkin melons? Also I have one watermelon plant growing, but it is small. My pepper plants are producing an abundance of peppers with my big bertha peppers producing the most. My yellow beans taste fantastic and I have picked several hundred of them, way too many. The onions and garlic tops have begun to die out so I have to get a farming fork and dig the bulbs out. I am excited to have fresh garlic. Lastly my beets are doing well and starting to get pretty large and may need picking in 1-2weeks. It is hard to believe Summer gardening is almost over. I went to the flower nursery the other day and would you believe everything was Mums. Wow talk about time flying by. Anyways Happy Gardening!!!

"Soil Moisture Anomalies and 5-day Precipitation Amounts from Hydro Prediction Center"

(Courtesy of NOAA)

"Severe Weather Potential/Probability"(Updated 8/01)
A few severe weather chances look to occur this week as a series of disturbances rotate through the region. Sunday an upper level trough will be rotating across the Great Lakes with the lee trough passing through central Pennsylvania through Maryland around noon. Bulk shear values ahead of the lee trough will be around 40knots. Some morning low stratus may prevent initial morning sunshine over eastern areas, but the clouds should burn off. Meanwhile a few rain showers and an isolated thunderstorm is possible over western Pennsylvania in the morning closer to the front. Clouds will be widespread east of the State College-Altoona-Hagerstown line throughout the day. With a few peaks of sunshine over areas east of the line at least some meager SBCAPE near 1500 j/kg may develop with 2000 j/kg over far southeastern areas in Maryland and Delaware up through Philadelphia. Cooling cloud tops by afternoon combined with surface temperatures in the 80s and dewpoints in the 70s will allow thunderstorms to form with severe weather possible in eastern areas. Damaging winds appear to be the primary threat as temperatures aloft remain pretty warm and freezing levels above 12000ft, but hail cannot be ruled out. This event is lacking the kinematics that the recent two severe events had, so the tornado threat is not near as high. The frontal boundary will push to the south by late evening with dying convection. Monday will feature a few pulse thunderstorms as the boundary remains close to the region, but severe weather is not likely. Although a few 40mph wind gusts are possible as pulse cell cores collapse. Tuesday afternoon another front rolls through from northwest to southeast. Again surface heating will not be widespread thanks to some clouds, but there may be more heating than the last few severe events. CAPE values up to 2500 j/kg are possible over northern Maryland and Delaware up through southern Pennsylvania in the southcentral region. High bulk shear values and a strong low level jet will promote damaging winds as the primary threat. Cold air aloft moving in with the trough will also allow for some hail and frequent lightning under high ice crystal growth. Conditions quiet as high pressure remains in control through Friday before the flow turns back to the southwest allowing moisture to increase with daily chances of convection. But with lack of organized trigger severe weather does not look likely through at least Saturday. So for this week the best chances of severe weather will be Sunday for eastern areas and Tuesday for a majority of the region. Tuesday may feature a squall line at least according to some guidance. Stay tuned!

"Severe Weather Outlooks from Storm Prediction Center Days 1, 2, and 3"

(Courtesy of NOAA)

"Atlantic Ocean Tropical Discussion"(Updated 8/01)
The tropics continue to be extremely quiet over the region as we enter a new month, August. First a note of interest brings one to the central Pacific where Tropical Storm Lana churns across the waters south of the Hawaiian Islands. Winds are near 50mph sustained with 60mph gusts. This compact system will likely slowly weaken over time as it enters cool waters and a higher sheared environment. Only impacts to the Hawaiian Islands will be increased swells on the southeastern shores and an increase in moisture for afternoon showers and thunderstorms. Across the eastern Pacific things remain abnormally quiet as only 4 named systems have formed this year which is very odd especially considering the Eastern Pacific hurricane season begins earlier than the start of the Atlantic hurricane season. No development is expected within the next 3-5days. The Atlantic basin continues to be quiet with only a tropical depression having formed this year. But the African dust seems to be dissipating over the Atlantic Basin. Also water temperatures continue to warm up to near 27C over the central Atlantic. Currently a few rain showers and thunderstorms are occurring off the coast of Honduras, but no development is expected as activity remains diurnally driven. Elsewhere sunshine prevails across the Caribbean. A few tropical waves have been moving off the coast of Africa, one possible of interest. Current infrared satellite shows a nice area of convection as this wave exits the African coastline. Shear levels remain high over 20knots, but will be waning over the next several days. Dry air also is prevalent over the area. But a few of the forecast models show possible development including the ECMWF, GFS, and CMC. For now little to development will occur by Monday, but later in the week this areas bears watching. For now enjoy another quiet week in the Atlantic.

"Current SSTs and Tropical Systems/Atlantic Infrared Satellite"

(Courtesy of Wunderground)

"Monthly Temperature/Precipitation Outlook"(August)(Updated 7/27)
After a below normal June and July, August may try to tap into some warmer air. In June temperatures averaged around -.5degrees across Pennsylvania despite few if any 90degree high temperature days. The warmest conditions oddly enough occurred this year in April. But we are entering a slight pattern change. The trough situated over the east coast will begin to pivot westward over an extended period of time. This will keep the core of the cooler air and trough axis over the Great Lakes. But this does not mean warm air is going to be surging up the coast. Further downstream the trough over Europe will still be over eastern areas and until this trough is replaced with a ridge, the east coast of the US will continue to be lacking in above normal temperatures. With the trough axis slightly to the west of the region, this will place the Northeast is an active pattern for disturbances and rainfall. They will develop along the lower end of the trough and move northeast up the trough. Also something interesting is how this deep stubborn trough will stall in the Southeast off the coast and Gulf of Mexico. As mentioned earlier, I am still monitoring the possibility of tropical development on the axis of the lower end of the trough. For now that is just an outside chance, but still I expect the Atlantic tropical season to start getting in gear during the month of August with the Gulf of Mexico and southeast coastline at the highest threat for any land falling system.

Temperature- Temperatures should average around normal from (-.5)-(+.5) with areas across the western half of the state slightly cooler than eastern areas. This Summer will surely be one to remember with the crystal clear blue skies and dry air, but during August I do expect humid conditions to be a common theme during a majority of the month. Temperatures should be warmer in the first half of the month as cool air reloads across the Arctic Circle as the NAO surges near neutral. But during the end of the month I expect a return to near negative NAO values with below normal temperatures along with the trough axis moving back east as the EPO values surge back to negative too.

Precipitation- This month looks to be fairly wet with normal to above normal precipitation thanks to the trough axis to our west, but a flow bringing in Gulf Disturbances on up the coast. Also any tropical influences will likely make landfall and head up the east coast states causing heavier rain. The highest chance of above normal rainfall will be over southern areas thanks to high instability forming stronger thunderstorms with heavy rain. I still have the first week in August open as a period with possible severe weather being likely as disturbances rotate in from the Lakes with possible severe thunderstorm squall lines, but for now that remains about 1-2 weeks away.

"Temperature and Precipitation Outlooks from Climate Prediction Center for next 30 days"

(Courtesy of NOAA)

"Here 10mi Northeast of Harrisburg, PA 2009 Statistics"
(Severe Weather Stats...)
Severe Thunderstorm Watches- 5
Severe Thunderstorm Warnings- 5
Tornado Watches- 0
Tornado Warnings- 0
Total Thunderstorms- 27

(Precipitation Stats...)
Flood Watches- 3
Flood Warnings- 1
Monthly Precipitation- 1.00inches
Yearly Precipitation- 24.67inches

(Temperature Stats...)
Heat Advisories- 0
Excessive Heat Warnings- 0
90degree Days- 5
Highest Temperature- 92degrees

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188. Zachary Labe
2:45 AM GMT on August 10, 2009
***New severe thunderstorm watch for northern into the middle Susquehanna Valley of Pennsylvania.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
187. upweatherdog
2:21 AM GMT on August 10, 2009
Quoting weathergeek5:
If you could, could you explain how long lived storms like this form? It is not too often that these form around our neck of the woods right?


Forward propagating MCS's form along a warm front USUALY at night or in the early morning as CIN decreases and high instability that has built up is released. (There is a word for this process, but I forgot it.LOL) Storms develop, and a intensifying nocternal low level jet feeds moisture into the storms so they grow. Strong winds aloft and shear keep the storms well vented and pushed at a fast speed. As updrafts bring high amounts of moisture into the storm, cool downdrafts sink to the surface at high speeds, producing downbursts. The strong low level jet feeds more moist, warm air into the storm, thus the downdrafts can continue without killing the storm. Shear also helps with this process. Adventually the downbursts start to create bookend vorticies on the north and south ends of the MCS, and a rear inflow jet develops as a cool pool aloft develops. The storm now can be though of as a actual low pressure system with a cold front (gust front) and a warm front which is where the warm air wraps in and up into the storm on the north end. Usually the "warm front" can be seens as a band of thunderstorms extending out ahead strait from the comma head. This signals strong warm air inflow. The storm can now sustain itself a produce widespread wind damage.

During the day, strong shear and plenty of instability make up for the lack of a low level jet.
Member Since: October 14, 2007 Posts: 173 Comments: 1372
186. Zachary Labe
2:14 AM GMT on August 10, 2009
weathergeek5- Alright I will be sure to include that in the discussion.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
185. weathergeek5
2:02 AM GMT on August 10, 2009
If you could, could you explain how long lived storms like this form? It is not too often that these form around our neck of the woods right?
Member Since: December 25, 2005 Posts: 0 Comments: 1744
184. Zachary Labe
2:00 AM GMT on August 10, 2009
weathergeek5- Of course!

upweatherdog- I agree with that classification perfectly. The thing going for the complex in New York is an increasing low level jet and high bulk shear really supporting the system. There is a lot of moisture aloft with a slight elevated instability level. It will be interesting to see what happens in some areas tonight, but you are right much of Pennsylvania is currently semi-stablized.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
183. upweatherdog
1:58 AM GMT on August 10, 2009
Quoting Blizzard92:
wxgeek723- Sounds like fun! Well dark is an uneasy feeling for a lot of people because it questions the UKNOWN. It puts in perspective and question what one cannot see and whether their fears are only fears or realities. Anyways the storms hit here to around 525pm or so, maybe a bit earlier.

upweatherdog- Well I would question thanks to one thing only... there was only a slight increasing forward speed. Usually derechos are traveling at nearly 50-60knots, but this bow echo was moving a bit slower. But you are exactly right the threshold is 250miles in damage.


True, that is a problem. I think it would be considered just a long track forward propagating MCS with damaging wind or a squall line.lol

Seems like parameters arent as good as this morning for the new MCS over western NY. Convection over central NY looks mainly elevated, with no SBCAPE. I would think this forward propagating MCS would die by the time it reaches central NY or northern PA, due to it being mainly surface based. However, it appears that a squall line with bowing line segments may develop over western PA where beter instability exists and head east southeastward over night with a lessening severe threat.
Member Since: October 14, 2007 Posts: 173 Comments: 1372
182. weathergeek5
1:55 AM GMT on August 10, 2009
You will be summarizing the bow echo/severe storm event in tomorrow's blog right?
Member Since: December 25, 2005 Posts: 0 Comments: 1744
181. Zachary Labe
1:38 AM GMT on August 10, 2009
wxgeek723- Sounds like fun! Well dark is an uneasy feeling for a lot of people because it questions the UKNOWN. It puts in perspective and question what one cannot see and whether their fears are only fears or realities. Anyways the storms hit here to around 525pm or so, maybe a bit earlier.

upweatherdog- Well I would question thanks to one thing only... there was only a slight increasing forward speed. Usually derechos are traveling at nearly 50-60knots, but this bow echo was moving a bit slower. But you are exactly right the threshold is 250miles in damage.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
180. upweatherdog
1:37 AM GMT on August 10, 2009
Looks like this mornings MCS can be classified as a derecho because it produced damaging wind reports in a swath of 250 miles, if I remember the derecho cirteria correctly.
Member Since: October 14, 2007 Posts: 173 Comments: 1372
179. wxgeek723
1:32 AM GMT on August 10, 2009
Wow Bliz. I'm down in Cape May visiting relatives, and we just got blasted with what it seems to me the most intense thunderstorm I've seen recently, though probably nothing compared to the Tornado Warning up by Du Bois. We had to have gotten at least 1.5-2" in say 40 minutes, and lightning was extremely frequent. I was looking at it from a front window, and there were strikes everywhere. Loud, long, and frequent thunder, and howling winds. Oh yeah and the dark grey clouds made 8PM look like 10PM. I have to admit I was a bit frightened. Not sure why but of all the things in a thunderstorm, it's the dark clouds that make me feel uneasy.
Member Since: August 28, 2008 Posts: 79 Comments: 3714
178. Zachary Labe
12:57 AM GMT on August 10, 2009
Quoting TheDawnAwakening:
Blizzard, how was the MCS and line of storms? Also what are your thoughts on the MCS in Southern Ontario once again?

A lot of rain and some gusty winds, surrounding counties had wind damage. Not sure yet on track of the newest MCS. It may head towards NYC depending on how far north the warm front moves. Sort of wait and see game what axis it takes once it enters New York State.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
177. weathergeek5
12:56 AM GMT on August 10, 2009
Tomorrow it will be, cannot believe it is this first time all summer that I am saying this, Hazy hot and humid. We now have an excessive heat warning in effect.
Member Since: December 25, 2005 Posts: 0 Comments: 1744
176. TheDawnAwakening
12:01 AM GMT on August 10, 2009
Blizzard, how was the MCS and line of storms? Also what are your thoughts on the MCS in Southern Ontario once again?
Member Since: October 21, 2008 Posts: 248 Comments: 3970
175. Zachary Labe
11:58 PM GMT on August 09, 2009
weathergeek5- Sounds like fun, lol! A few branches and tons of twigs and leaves down as I drove around the town. Some damage reports in the surrounding counties, but none in mine. Did you see a tornado was officially reported in Clearfield County?


***Reminder new blog out first thing early tomorrow morning around 600am.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
174. weathergeek5
11:14 PM GMT on August 09, 2009
Ok I am back. I am still hearing constant thunder shaking the house but the storms are now pulling away from me. In a town to my west a 64 mph gust of wind was recorded. For me as with blizz it did not get dark till the rain shield was right over me. The winds were extremely gusty then the rain started. As usual I got soaked to the skin. I believe this is the 3rd weekend in a row that I got soaked (observation firsthand) in a storm. Here is the warning update of the storm before it expires in a few minutes:

6:38 PM EDT sun Aug 9 2009

... A Severe Thunderstorm Warning remains in effect until 715 PM EDT
for New Castle and Cecil counties...

At 635 PM EDT... National Weather Service Doppler radar continued to
indicate a line of severe thunderstorms capable of producing damaging
winds in excess of 60 mph. These storms were located along a line
extending from Arden to Richardsmere... or along a line extending from
8 miles north of Wilmington to 18 miles west of Elkton... moving
southeast at 45 mph.

Severe thunderstorms will be near...
Cherry Hill... Bay View... Barksdale and Port Deposit by 645 PM
EDT...
Glasgow... bear... Elkton and Charlestown by 650 PM EDT...
Hollywood Beach and Brantwood by 655 PM EDT...

Precautionary/preparedness actions...

This storm has a history of producing wind damage across Chester
County. This is an extremely dangerous situation. Seek shelter
now inside a sturdy structure and stay away from
windows and trees!
Member Since: December 25, 2005 Posts: 0 Comments: 1744
173. weathergeek5
10:19 PM GMT on August 09, 2009
I am hearing deep rumbles in the distance now. The sound is constant now. i better shut down the PC now will be back after the storms if I have power. Will give a complete report when I return.
Member Since: December 25, 2005 Posts: 0 Comments: 1744
172. Zachary Labe
10:15 PM GMT on August 09, 2009
weathergeek5- Very dark, but not until the very minute the rain started. The haze out there really prevents any visibility of the storm.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
171. weathergeek5
10:12 PM GMT on August 09, 2009
Does not look all that ominous yet but these storms are going at a pretty good clip. Did it get very dark before the storm hit you?
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170. Zachary Labe
10:10 PM GMT on August 09, 2009
weathergeek5- Good luck! Keep us informed!
Member Since: December 14, 2007 Posts: 285 Comments: 15140
169. weathergeek5
10:04 PM GMT on August 09, 2009
The National Weather Service in Mount Holly NJ has issued a

* Severe Thunderstorm Warning for...
Cecil County in northeast Maryland...
this includes the city of Elkton...
New Castle County in northern Delaware...
this includes the cities of... Wilmington... Newark... Middletown...
southern Chester County in southeast Pennsylvania...

* until 715 PM EDT

* at 549 PM EDT... National Weather Service Doppler radar indicated a
severe thunderstorm capable of producing penny size hail... and
damaging winds in excess of 60 mph. This storm was located 17
miles northwest of Parkesburg... or 11 miles northeast of
Lancaster... and moving southeast at 35 mph.

* The severe thunderstorm will be near...
Parkesburg around 615 PM EDT...
Cochranville and Homeville around 625 PM EDT...
Mount Vernon around 630 PM EDT...
West Grove and Oxford around 635 PM EDT...
Blake... Lombard and ladenberg around 640 PM EDT...
Fair Hill around 645 PM EDT...

Precautionary/preparedness actions...

Numerous trees and wires were knocked down with this thunderstorm
complex throughout Berks County. Please take this storm seriously.

In addition to large hail and damaging winds... continuous cloud to
ground lightning is occurring with this storm. Move indoors
immediately! Lightning is one of natures greatest killers.
Remember... if you can hear thunder... you are close enough to be
struck by lightning.

Heavy rain will occur with these storms and cause low-lying
and poor drainage flooding.
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168. Zachary Labe
10:02 PM GMT on August 09, 2009
1.22inches of rain total here. Decent amount of thunder, but haze prevented visibility of lightning.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
167. weathergeek5
9:51 PM GMT on August 09, 2009
Quoting RkTec:
The fireworks are just beginning here.


where are you at?
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166. weathergeek5
9:49 PM GMT on August 09, 2009
That is how I see it too. How much rain and lightning are with these storms? I am about ready to move my observation operations outside.
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165. RkTec
9:48 PM GMT on August 09, 2009
The fireworks are just beginning here.
Member Since: January 27, 2009 Posts: 0 Comments: 384
164. Zachary Labe
9:44 PM GMT on August 09, 2009
weathergeek5- Even though I didn't see much wind over 30mph, we still had quite a lot of rain. The storms will slowly weaken, but... being that that area the storms will need to cross in Lancaster and Chester Counties to get to your area; they have seen a lot of heating late this afternoon which may help survive some of the embedded stronger cells.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
163. weathergeek5
9:37 PM GMT on August 09, 2009
Blizz that is what I am seeing too. I still think I could get some gusty winds with these storms.
Member Since: December 25, 2005 Posts: 0 Comments: 1744
162. Zachary Labe
9:30 PM GMT on August 09, 2009
Snowlover2010- It appears the storms are weakening pretty quickly due to the dynamics aloft not being as strong across the south thanks to the warm front washing out over the region. Tornadoes shouldn't be likely, but you never about Lancaster County, lol, being that Lancaster seems to get an isolated tornado out of a garden shower, lol.

shoreacres- I am 10miles northeast of Harrisburg. I guess I had some of those Texas tropical downpours with a rain rate at one point of 10.11inches per hour. Thanks for checking in on me!
Member Since: December 14, 2007 Posts: 285 Comments: 15140
161. shoreacres
9:27 PM GMT on August 09, 2009
Blizzard -

I see most of it's clipping the east side of Harrisburg - are you off to the west?
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160. Snowlover2010
9:26 PM GMT on August 09, 2009
Should be interesting. You see any more possible tornadoes coming out of this, or are we safe from them?
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159. Zachary Labe
9:24 PM GMT on August 09, 2009
Snowlover2010- Hey! Long time no see! Thunderstorm is rolling through here not too bad, but Blue Mountain shelters me to the north so storms from the north are never too strong here. Rain rate is impressive though currently 10.11inches per hour!!! Thanks for checking in! Severe thunderstorm warning now out for Lancaster County.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
158. Snowlover2010
9:20 PM GMT on August 09, 2009
These storms look like they could do me some damage here in Lancaster!
Member Since: January 7, 2008 Posts: 2 Comments: 1003
157. Zachary Labe
9:11 PM GMT on August 09, 2009
Huge shelf cloud and very strong winds, gusting to about 30mph currently. Light rain with deep thunder rolls.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
156. TheDawnAwakening
9:08 PM GMT on August 09, 2009
The strongest storm of the line is to the northeast of Harrisburg, PA, but Blizzard should get hit pretty hard.
Member Since: October 21, 2008 Posts: 248 Comments: 3970
155. Zachary Labe
9:05 PM GMT on August 09, 2009
*Thundering here!

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
456 PM EDT SUN AUG 9 2009

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* TORNADO WARNING FOR...
NORTHEASTERN CLEARFIELD COUNTY IN CENTRAL PENNSYLVANIA...
SOUTHEASTERN ELK COUNTY IN NORTH CENTRAL PENNSYLVANIA...

* UNTIL 530 PM EDT

* AT 453 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR FORCE...OR
11 MILES SOUTH OF ST. MARYS...MOVING SOUTHEAST AT 30 MPH.

* THE TORNADO WILL BE NEAR...
PARKER DAM STATE PARK...MEDIX RUN AND S.B. ELLIOT STATE PARK AROUND
505 PM EDT...
CLEARFIELD AROUND 525 PM EDT...
LECONTES MILLS AROUND 530 PM EDT...

THIS WILL IMPACT I-80 BETWEEN MILE MARKERS 113 AND 122.

THIS WILL ALSO IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 322 NEAR
CLEARFIELD...STATE ROAD 153...STATE ROAD 255.

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
154. MNTornado
9:01 PM GMT on August 09, 2009
WOW,
I didn't know that the East Coast got tornadoes also. Now you have two warnings at the same time.
Member Since: July 1, 2005 Posts: 154 Comments: 19315
153. weathergeek5
8:59 PM GMT on August 09, 2009
It seems like that storm over reading may get close to me if it holds
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152. Zachary Labe
8:52 PM GMT on August 09, 2009
Lycoming CO, Pennsylvania...

COUNTY WIDE...WIDSPREAD LARGE TREES DOWN. NUMEROUS HOMES AND CARS DESTROYED BY FALLING TREES. ROUTE 44 CLOSED TO DUE TRESS ACROSS ROAD. WIDESPREAD DAMAGE IN LOYALSOCK.. (CTP)
Member Since: December 14, 2007 Posts: 285 Comments: 15140
151. Zachary Labe
8:45 PM GMT on August 09, 2009
weathergeek5- I will be here to provide more updates.

*48.3mph wind gust reported in Selinsgrove from the band that will likely head my way!
Member Since: December 14, 2007 Posts: 285 Comments: 15140
150. weathergeek5
8:43 PM GMT on August 09, 2009
ahh ok. when I replied I did not see your answer that is was partly cloudy where you are. That is why I removed that comment. I am shocked of how humid the atmosphere changed after that warm front went though. Here in Delaware I have been in full sun for about 2 hours now. If the storms hold together they may stay at severe levels. at 1700hours we will need an update on the current dynamics of the storms.
Member Since: December 25, 2005 Posts: 0 Comments: 1744
149. Zachary Labe
8:38 PM GMT on August 09, 2009
Quoting weathergeek5:
are the skies dark where you are?

The problem for me is I sit along a mountain foothills with the mountain to my north. This blocks much of my view to the north until a storm is nearly on top of me.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
148. TheDawnAwakening
8:38 PM GMT on August 09, 2009
Wow, Blizzard stay safe. Focus on today and tomorrow will come later. Anyways the GFS continues to show insane numbers, not like previous runs, but CAPE exceeds 2000j/kg over much of SNE.
Member Since: October 21, 2008 Posts: 248 Comments: 3970
147. weathergeek5
8:37 PM GMT on August 09, 2009
keep us posted!!
Member Since: December 25, 2005 Posts: 0 Comments: 1744
146. Zachary Labe
8:33 PM GMT on August 09, 2009
*Recent velocity scans show some weakening and disorganization, but the complex continues to bow out with the highest wind threat right now heading through eastern Northumberland County heading towards Reading in about 30minutes.

weathergeek5- 86degrees with a 79degree dewpoint!!! Partly cloudy.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
145. weathergeek5
8:32 PM GMT on August 09, 2009
what are your current conditions Blizz?
Member Since: December 25, 2005 Posts: 0 Comments: 1744
144. Zachary Labe
8:27 PM GMT on August 09, 2009
TheDawnAwakening- The NAM handled temperatures better today and probably for tomorrow.

I am under a severe thunderstorm warning!!!

SEVERE THUNDERSTORM WARNING FOR...
SOUTHERN MONTOUR COUNTY IN CENTRAL PENNSYLVANIA...
LEBANON COUNTY IN SOUTH CENTRAL PENNSYLVANIA...
DAUPHIN COUNTY IN SOUTH CENTRAL PENNSYLVANIA...
NORTHEASTERN PERRY COUNTY IN SOUTH CENTRAL PENNSYLVANIA...
NORTHEASTERN JUNIATA COUNTY IN CENTRAL PENNSYLVANIA...
SNYDER COUNTY IN CENTRAL PENNSYLVANIA...
SCHUYLKILL COUNTY IN CENTRAL PENNSYLVANIA...
NORTHUMBERLAND COUNTY IN CENTRAL PENNSYLVANIA...
COLUMBIA COUNTY IN CENTRAL PENNSYLVANIA...
SOUTHERN UNION COUNTY IN CENTRAL PENNSYLVANIA...

* UNTIL 530 PM EDT

* AT 422 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 80 MPH.
THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 15 MILES NORTHEAST OF JERSEYTOWN TO SELINSGROVE
TO SNYDER-MIDDLESWARTH STATE PARK...AND MOVING SOUTHEAST AT 55 MPH.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
143. TheDawnAwakening
8:25 PM GMT on August 09, 2009
Wow a tornado. The GFS tomorrow looks like someone fed it some steroids, CAPE near 2000j/kg to 3000j/kg around 8pm tomorrow as well as LI values of -6 to -8 for interior SNE. NAM is less than impressive. Which one should I side with? GFS, because the warm front is still heading northeastward at a good clip, but the current/ongoing MCS could keep it from moving further northward.
Member Since: October 21, 2008 Posts: 248 Comments: 3970
142. Zachary Labe
8:14 PM GMT on August 09, 2009
TORNADO WARNING
PAC047-092100-
/O.NEW.KCTP.TO.W.0008.090809T2010Z-090809T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE STATE COLLEGE PA
410 PM EDT SUN AUG 9 2009

THE NATIONAL WEATHER SERVICE IN STATE COLLEGE PA HAS ISSUED A

* TORNADO WARNING FOR...
EASTERN ELK COUNTY IN NORTH CENTRAL PENNSYLVANIA...

* UNTIL 500 PM EDT

* AT 408 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
JOHNSONBURG...MOVING SOUTHEAST AT 25 MPH.

* THE TORNADO WILL BE NEAR...
ST. MARYS AROUND 420 PM EDT...
FORCE AROUND 445 PM EDT...
MEDIX RUN AND BENEZETTE AROUND 450 PM EDT...

THIS WILL IMPACT THE FOLLOWING MAJOR ROADS...ROUTE 219 NEAR
RIDGWAY...STATE ROAD 120...STATE ROAD 255.

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING
LARGE SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY
ALREADY BE ON THE GROUND...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU
ARE IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE
LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO
NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...TAKE SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN A MOBILE HOME OR VEHICLE...LEAVE IT AND GET INSIDE A STRONG
BUILDING. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH
OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT SUNDAY
EVENING FOR NORTH CENTRAL PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH
ALSO REMAINS IN EFFECT UNTIL 1000 PM EDT SUNDAY EVENING FOR CENTRAL
PENNSYLVANIA.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
141. Zachary Labe
8:00 PM GMT on August 09, 2009
weathergeek5- Depends on if it increases its forward speed.


Tornado reported in NY...
PUBLIC REPORTED TORNADO TOUCHDOWN IN THE VICINITY OF RUSHFORD. WIDESPREAD DAMAGA REPORTED (BUF)
Member Since: December 14, 2007 Posts: 285 Comments: 15140
140. weathergeek5
7:54 PM GMT on August 09, 2009
what time will these arrive for us?
Member Since: December 25, 2005 Posts: 0 Comments: 1744
139. Zachary Labe
7:53 PM GMT on August 09, 2009
* SEVERE THUNDERSTORM WARNING FOR...
MONTOUR COUNTY IN CENTRAL PENNSYLVANIA...
SNYDER COUNTY IN CENTRAL PENNSYLVANIA...
SOUTHEASTERN TIOGA COUNTY IN NORTH CENTRAL PENNSYLVANIA...
NORTHUMBERLAND COUNTY IN CENTRAL PENNSYLVANIA...
COLUMBIA COUNTY IN CENTRAL PENNSYLVANIA...
SULLIVAN COUNTY IN NORTH CENTRAL PENNSYLVANIA...
UNION COUNTY IN CENTRAL PENNSYLVANIA...
SOUTHEASTERN CLINTON COUNTY IN NORTH CENTRAL PENNSYLVANIA...
EASTERN LYCOMING COUNTY IN NORTH CENTRAL PENNSYLVANIA...
EAST CENTRAL CENTRE COUNTY IN CENTRAL PENNSYLVANIA...

* UNTIL 430 PM EDT

* AT 341 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
IN EXCESS OF 80 MPH.
THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 15 MILES NORTH OF SHUNK TO JERSEY SHORE TO 17 MILES
WEST OF MILL HALL...AND MOVING SOUTHEAST AT 55 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
WILLIAMSPORT AND LOYALSOCKVILLE AROUND 350 PM EDT...
MONTOURSVILLE AND ELIMSPORT AROUND 355 PM EDT...
REBERSBURG AND MONTGOMERY AROUND 400 PM EDT...
OVERTON AND MILLHEIM AROUND 405 PM EDT...
WEIKERT AND LINNTOWN AROUND 410 PM EDT...
LAIRDSVILLE AND WINFIELD AROUND 415 PM EDT...

THIS WILL IMPACT THE FOLLOWING CENTRAL PENNSYLVANIA INTERSTATES...
I-80 BETWEEN MILE MARKERS 169 AND 243...I-180 BETWEEN MILE MARKERS 1
AND 29.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS CONTAIN DAMAGING WINDS 58 MPH OR STRONGER...OR
HAIL THREE QUARTERS OF AN INCH OR LARGER. FOR YOUR SAFETY...TAKE
SHELTER INSIDE A BUILDING LOCATION NOW.

PLEASE REPORT HAIL...STRONG WINDS OR WIND DAMAGE TO THE NATIONAL
WEATHER SERVICE BY CALLING TOLL FREE...1 8 7 7 6 3 3 6 7 7 2.

THIS LINE OF SEVERE THUNDERSTORMS HAS A HISTORY OF PRODUCING WIND
DAMAGE ACROSS ALL OF NORTHERN PENNSYLVANIA.
TAKE SHELTER NOW INSIDE
A STURDY BUILDING...AND STAY AWAY FROM WINDOWS!

WIND DAMAGE WITH THIS LINE OF SEVERE THUNDERSTORMS MAY OCCUR WELL
AHEAD OF ANY THUNDER. DO NOT WAIT FOR THE SOUND OF THUNDER BEFORE
TAKING COVER.


A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 700 PM EDT SUNDAY
EVENING FOR NORTH CENTRAL PENNSYLVANIA. A SEVERE THUNDERSTORM WATCH
ALSO REMAINS IN EFFECT UNTIL 1000 PM EDT SUNDAY EVENING FOR CENTRAL
PENNSYLVANIA.
Member Since: December 14, 2007 Posts: 285 Comments: 15140
138. Zachary Labe
7:36 PM GMT on August 09, 2009
Several couplets in the bowecho so small quick hitting tornadoes are a definite possibility...
Member Since: December 14, 2007 Posts: 285 Comments: 15140

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