MIssissippi tornado rated a violent EF-4

By: Dr. Jeff Masters , 2:30 PM GMT on April 27, 2010

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The devastating tornado that ripped through Mississippi on Saturday April 24, killing ten, was a violent EF-4 twister with 170 mph winds when it hit Yazoo City, according to a preliminary damage survey by the National Weather Service in Jackson, Mississippi. The tornado touched down near Tallulah, Louisiana, crossed the Mississippi River into Mississippi, and traversed nearly the entire state of Mississippi, carving a 149-mile long path of destruction. It is extremely rare for a tornado to stay on the ground this long. The world record longest path by a tornado is the 219-mile long path of the deadliest tornado in U.S. history, the violent F-5 Tri-State Tornado of 1925, which killed 695 people in Missouri, Illinois, and Indiana.


Figure 1. A church in Yazoo City works to restore its toppled steeple after Saturday's tornado. Image credit: J.A.

Saturday's tornado was strong almost from its initial stage of development in northeast Louisiana. EF-2 and EF-3 damage was common all along the tornado's path into central Mississippi with areas of EF-4 damage observed in both Yazoo and Holmes counties. After crossing Interstate 55, the tornado weakened with EF-1 and occasional EF-2 damage being common as the tornado moved across Attala County. The tornado re-intensified as it moved into Choctaw County, with at least high end EF-3 damage occurring northwest of the Weir community. The tornado remained strong before rapidly weakening and then dissipating just after moving into Oktibbeha County. It was the first violent EF-4 tornado of 2010. Over the past decade, the U.S. has averaged five violent EF-4 or EF-5 tornadoes per year. Our severe weather expert, Dr. Rob Carver, has a more detailed analysis of Saturday's tornado.


Figure 2. One mile wide wedge tornado from near Yazoo City, Mississippi on April 24, 2010. Tornadovideos.net intercepted the tornado near Holly Bluff just east of the Mississippi River, and tracked the huge wedge to the damage path in Yazoo City, after which they assisted with the rescue effort until emergency personnel gained control of the situation.

Portlight assesses needs after the Mississippi tornado
Portlight.org volunteer Riki Chomsky (AKA "kitchengypsy") paid a visit to tornado-ravaged Yazoo City, Mississippi on Sunday to assess whether or not Portlight should mount a response effort. Her report:

At this time, Portlight has decided not to deploy an emergency feeding unit to Yazoo City. We base this decision on 3 factors:

1) Scope. Although the scenes of devastation are terrible, by our estimate, more than half the city is relatively unharmed. With several restaurants, gas stations and other services open for business in such close proximity to the command center, we have faith that continuity of operations will soon be established for the whole city.

2) Current efforts: All current relief teams, with special emphasis on the Red Cross and Salvation Army, are doing an excellent job of handling the situation. They have taken pains to ensure food distribution across the affected areas, and we have confidence that they are truly the best organizations for this type of situation.

3) Anticipated Need / Speed of Recovery: although the extent of the damage will most likely require outside work crews, we saw very encouraging signs of progress. Work crews were active at almost every damaged site, which is highly impressive for less than 24 hours after the storm. Even when volunteer crews are brought in, we anticipate their needs being more than adequately met by the existing local churches, who have already started feeding work crews and rescue personnel. In addition to the Red Cross and Salvation Army, Portlight extends our appreciation to all members of this exemplary community response. While the damage is significant, the Salvation Army and local Red Cross seem to be doing a great job meeting the needs there, and Portlight recommends supporting one of these organizations.

Portlight continues aid efforts in Haiti
Portlight continues to focus its energy and funds on the situation in Haiti, where the rainy season is fast approaching the needs for shelter, medical supplies, food and water remain urgent. Their latest effort is a shipment of 10 pallets of Durable Medical Equipment, 30 pallets of water, 7,000 pounds of rice, a number of tents, tarps and various building supplies totaling some 14,000 pounds of goods. The supplies were loaded onto the schooner Halie and Mathew. The schooner was slowed by bad weather on its way to Haiti, and was forced to dock in Jamaica to make repairs. The ship is expected to land in Haiti later this week to deliver its supplies. Please visit the Portlight.org web site or the Portlight blog to learn more and to donate to this worthy cause.


Figure 3. Relief supplies for Haiti earthquake victims being loaded onto the schooner Halie and Mathew.

Jeff Masters

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The CPC probability of temperature anomalies for the August-September-October period:


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Time-longitude plot of AVHRR AMSR OI SSTs in the MDR (averaged 10N-20N) since the beginning of the month:

With the top of the image being the most recent (April 26th). Day "0" at the bottom is April 1st, and day "25" at the top is April 26th.

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Velocity Image of Greensburg Tornado

Member Since: June 28, 2006 Posts: 25 Comments: 8418
Quoting Jeff9641:


This means days of nasty seabreeze collisions across the FL Penisula starting this weekend and into all of next week as tropical moisture is going to slide toward FL from the GULF.


Sweet! We need the rain...although the El Nino winter has helped erase almost a third of our 15 inch rain deficit!
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Quoting GTcooliebai:

Yep definately a strange smell up here in clearwater. To me it smells like oil. And with another front set to move through the area don't be surprise it gets worse.


Drill baby drill! Ack! Gag! Cough! UGH!
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Member Since: June 28, 2006 Posts: 25 Comments: 8418
Member Since: June 28, 2006 Posts: 25 Comments: 8418

Severe Thunderstorm Warning

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE COLUMBIA SC
421 PM EDT TUE APR 27 2010

SCC025-057-272045-
/O.CON.KCAE.SV.W.0019.000000T0000Z-100427T2045Z/
LANCASTER SC-CHESTERFIELD SC-
421 PM EDT TUE APR 27 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM EDT
FOR CHESTERFIELD AND LANCASTER COUNTIES...

AT 414 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LIKELY SEVERE THUNDERSTORM. THIS STORM WAS LOCATED NEAR
THE CHESTERFIELD AND LANCASTER COUNTY LINE JUST WEST OF PAGELAND.
MOVEMENT WAS EAST NEAR 45 MPH AND TOWARD THE PAGELAND AREA.

EXPECT DAMAGING WIND AND HAIL WITH THIS THUNDERSTORM.

REPORT LARGE HAIL...DAMAGING WINDS OR FLOODING TO YOUR COUNTY
SHERIFF...OR CALL THE NATIONAL WEATHER SERVICE TOLL FREE AT 1 877 6 3
3...6 7 7 2.

LAT...LON 3481 8060 3481 8032 3465 8034 3471 8065
TIME...MOT...LOC 2020Z 290DEG 38KT 3473 8037

$$




Member Since: June 28, 2006 Posts: 25 Comments: 8418

Severe Thunderstorm Warning

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE WILMINGTON NC
427 PM EDT TUE APR 27 2010

NCC155-SCC033-272100-
/O.CON.KILM.SV.W.0006.000000T0000Z-100427T2100Z/
ROBESON NC-DILLON SC-
427 PM EDT TUE APR 27 2010

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR NORTH CENTRAL DILLON AND ROBESON COUNTIES...

AT 421 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS
LOCATED NEAR RAEMON...OR 10 MILES NORTHWEST OF SOUTH OF THE BORDER...
MOVING EAST AT 30 MPH.

THE SEVERE THUNDERSTORM WILL BE NEAR...
RAEMON BY 430 PM EDT...
SOUTH OF THE BORDER BY 435 PM EDT...
PURVIS BY 440 PM EDT...
PEMBROKE BY 445 PM EDT...
MCDONALD BY 450 PM EDT...
REX BY 455 PM EDT...

PLEASE REPORT HAIL...DOWNED TREES OR DAMAGING WINDS TO THE NATIONAL
WEATHER SERVICE IN WILMINGTON NC...TOLL FREE AT 877-633-6772...WHEN
YOU CAN DO SO SAFELY.

LAT...LON 3489 7893 3484 7891 3467 7881 3457 7886
3449 7886 3445 7895 3440 7898 3434 7905
3450 7951 3461 7945 3464 7945 3477 7934
3481 7935 3484 7934 3484 7918 3496 7903
TIME...MOT...LOC 2025Z 284DEG 27KT 3459 7940

$$

RJD






Member Since: June 28, 2006 Posts: 25 Comments: 8418
Current regional dewpoints(F) and humidities in Central America:

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Member Since: June 28, 2006 Posts: 25 Comments: 8418
Quoting Patrap:
The one that affects the individual.


"Calamity knows no Borders"..

Quakes and Volcano's are not weather,..but geologic events.


but volcanoes can change weather
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April 17th AMSR-E Atmospheric Water Vapor:



April 27th AMSR-E Atmospheric Water Vapor:



You can see the significant increase in moisture that has occurred over the eastern Pacific in the past few days. The atmosphere is now very moist and unstable in that area with the NHC reporting Theta-E values of 360K and stations along the coast of Nicaragua reporting dewpoints of up to 27C.

Another thing apparent on the two images is the southward retreat of the ITCZ in the vicinity of the Lesser Antilles, evidenced by the decrease in moisture during the last 10 days as the high moisture values associated with the ITCZ retreat to the south.

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122. xcool
hey
Member Since: September 26, 2009 Posts: 2 Comments: 15707
im with pat ... two of your weather events arent weather ... Id say of the two hurricanes #1 tornadoes #2 .. my reasoning? hurrincanes can cause tornadoes tornadoes cant cause hurricanes :)
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Volcanoes have the greatest potential impact which would be the end of the world and tornadoes have the least global impact but the number of tornadoes vs the number of volcanic eruptions makes tornadoes the more likely deadly threat
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Quoting CaribBoy:
Wow the saharan dust is mighty dense here.


Where in the Caribbean you live? I am in San Juan,Puerto Rico. It is really warm here with some haze.
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The one that affects the individual.


"Calamity knows no Borders"..

Quakes and Volcano's are not weather,..but geologic events.
Member Since: July 3, 2005 Posts: 437 Comments: 134781
Quoting kimoskee:
Question: what do you think is the worst type of weather event? Hurricane, earthquake, tornado, volcano,etc.

Rank them = 1. is the worst


In terms of deadliest, I'd say Earthquake = 1, tornado = 2, hurricane = 3, and volcano = 4.

In terms of greatest overall impact, Volcanoes can take number 1 if it's a large, climate-altering eruption. Earthquakes would be 2nd, hurricanes 3rd, tornadoes 4th.
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Question: what do you think is the worst type of weather event? Hurricane, earthquake, tornado, volcano,etc.

Rank them = 1. is the worst
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Wow the saharan dust is mighty dense here.
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Recap of Severe Weather and National Weather On The Daily Downpour. Listen here!

Posted by: shauntanner, 12:17 PM CDT on April 27, 2010
Join meteorologists Shaun and Tim on The Weather Show today. On today's show, they will recap the severe weather from over the weekend, and talk about active national weather. Relief organization Portlight.org will call in to discuss their relief efforts in the tornado-hot areas of Mississippi. We will also have our thoughts on the oil spill in the Gulf of Mexico.

We will also be taking your phone calls!

Here is the schedule for today:

All times are in Eastern
4:00-4:10: National Forecast
4:10-4:20: Dr. Jeff Masters Blog Recap
4:20-4:30: Learning Corner
4:30-5:00: The Weather Show

Please join us. We promise you will learn something!
Member Since: July 3, 2005 Posts: 437 Comments: 134781
Eyjafjallajokull still going.

Link
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Long range GFS shows multiple lows near the Lesser Antilles. May could be interesting (I would prefer "May WILL be interesting" lol).

I'm So bored with this calm weather... hazy, dry, hot, sometime breezy.. and of course NO convective clouds!
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Quoting RitaEvac:
Oil coming to a shore near you. LA, MS, FL.

dont forget about us >.<
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Oil coming to a shore near you. LA, MS,AL, FL.
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A very warm afternoon in San Juan as it rose to 93F. And the warm temperatures will cause those waters to keep warming in the Caribbean.



<.CLIMATE...AT 123 PM AST...THE MERCURY REACHED 93 DEGREES AT THE
SAN JUAN LUIS MUNOZ MARIN INTERNATIONAL AIRPORT. THIS READING TIES
THE RECORD HIGH TEMPERATURE FOR THIS DATE OF 93 DEGREES SET IN
1992.
/strong>.
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The model battle continues to rage on the 12z runs. The 8-10 day 500mb comparison between the ECMWF(left) and GFS(right) shows the GFS still trying to shove troughing into the east and give an overall colder look to the pattern, but the Euro is still bullish on a solid ridge over the southeast through Day 10. The spring pattern favors the Euro solution with the big ridge over Alaska which jams all sorts of cold air into the west, arguing for ridging in the east. And by the way, I am REALLY happy about that ridge here in Alaska :)

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Interesting update to the previous Polish presidential plane crash blog. Four days prior to the crash, the airport installed a microwave landing system for Putin's arrival then REMOVED the system after he departed. Poland and Russia are conducting separate investigations but are "cooperating." The Poles will receive transcripts of the cockpit voice recorders NOT the voice recorders themselves...hmmmmm. Finally, the aircraft was equipped with a ground proximity warning system. If the system was functional, it would be the first crash of an aircraft with such a system in aviation history.

Link
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Quoting IKE:
12Z ECMWF...


The Euro continues to be solid on this pattern. The trough coming into the west gets absolutely stonewalled by the southeast ridge. It's going to be quite hot in the south the first 10 days of May, and this pattern is really going to warm up SSTs in the Gulf of Mexico.

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Winter Storm Warning

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE BURLINGTON VT
711 AM EDT TUE APR 27 2010

...HEAVY WET SNOW TO IMPACT HIGHER ELEVATIONS OF THE NORTHERN
ADIRONDACKS AND NORTHERN GREEN MOUNTAINS TODAY THROUGH
WEDNESDAY...

.AN UPPER LEVEL LOW PRESSURE SYSTEM WILL DROP SOUTH OUT OF QUEBEC
TODAY AND SLOWLY MOVE EAST THROUGH WEDNESDAY. PERSISTENT WRAP
AROUND MOISTURE AND COLD AIR WILL PROVIDE THE INGREDIENTS FOR A
LATE SEASON SNOWFALL...ESPECIALLY IN THE HIGHER ELEVATIONS OF
NORTHERN NEW YORK AND NORTHERN VERMONT.

PRECIPITATION WILL BEGIN AS A RAIN AND SNOW MIX THIS MORNING...
CHANGING TO ALL SNOW BY THIS AFTERNOON. THE HEAVIEST SNOW WILL
LIKELY FALL OVERNIGHT AS TEMPERATURES DROP BELOW FREEZING ACROSS
THE FORECAST AREA. SNOW WILL CONTINUE INTO WEDNESDAY ACROSS THE
HIGHER TERRAIN...WITH THE HEAVIEST SNOW MAINLY ABOVE 1000 FEET.

NYZ029>031-034-VTZ003-004-006-007-016-017-271915-
/O.CON.KBTV.WS.W.0003.100427T1200Z-100428T2000Z/
SOUTHEASTERN ST. LAWRENCE-SOUTHERN FRANKLIN-WESTERN CLINTON-
WESTERN ESSEX-ORLEANS-ESSEX-LAMOILLE-CALEDONIA-EASTERN FRANKLIN-
EASTERN CHITTENDEN-
INCLUDING THE CITIES OF...STAR LAKE...SARANAC LAKE...
TUPPER LAKE...DANNEMORA...LAKE PLACID...NEWPORT...ISLAND POND...
JOHNSON...STOWE...ST. JOHNSBURY...ENOSBURG FALLS...RICHFORD...
UNDERHILL
711 AM EDT TUE APR 27 2010

...WINTER STORM WARNING REMAINS IN EFFECT UNTIL 4 PM EDT
WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN BURLINGTON CONTINUES THE WINTER
STORM WARNING FOR HEAVY SNOW ACROSS THE NORTHERN ADIRONDACKS IN
NEW YORK AS WELL AS THE NORTHERN GREEN MOUNTAINS IN
VERMONT...UNTIL 4 PM EDT WEDNESDAY.

* 6 TO 12 INCHES OF HEAVY WET SNOW IS EXPECTED BEGINNING THIS
MORNING
THROUGH WEDNESDAY ACROSS THE HIGHER ELEVATIONS OF THE
NORTHERN ADIRONDACKS AND NORTHERN GREEN MOUNTAINS. ISOLATED
AREAS WILL HAVE SLIGHTLY HIGHER AMOUNTS...ESPECIALLY IN THE
JAY PEAK AREA.

* HEAVY WET SNOW COULD RESULT IN DOWNED TREE LIMBS AND POWER
LINES...WHICH IN TURN MAY CAUSE SCATTERED POWER OUTAGES. THIS
WILL BE A CONCERN TONIGHT INTO WEDNESDAY.

* A MIX OF RAIN AND SNOW THIS MORNING WILL CHANGE TO ALL SNOW
THIS AFTERNOON AND CONTINUE THROUGH WEDNESDAY MORNING BEFORE
TAPERING OFF TO SHOWERS LATE WEDNESDAY AFTERNOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER STORM WARNING FOR HEAVY SNOW MEANS SEVERE WINTER WEATHER
CONDITIONS ARE EXPECTED OR OCCURRING. SIGNIFICANT AMOUNTS OF
SNOW ARE FORECAST THAT WILL MAKE TRAVEL DANGEROUS. ONLY TRAVEL IN
AN EMERGENCY. IF YOU MUST TRAVEL...KEEP AN EXTRA FLASHLIGHT...
FOOD...AND WATER IN YOUR VEHICLE IN CASE OF AN EMERGENCY.

CHECK TO SEE IF YOU ARE PREPARED FOR POSSIBLE POWER OUTAGES...
INCLUDING HAVING ALTERNATE SOURCES FOR POWER AND HEAT.

PLEASE STAY TUNED TO NOAA WEATHER RADIO...YOUR LOCAL MEDIA...OR
GO TO WWW.WEATHER.GOV/BURLINGTON FOR FURTHER UPDATES ON THIS
WEATHER SITUATION.

$$

Member Since: June 28, 2006 Posts: 25 Comments: 8418
Quoting IKE:
12Z ECMWF...


HPC seems to agree

THE 12Z/27 GFS CONTINUES TO BE AT ODDS WITH THE STEADY THEME THE
EUROPEAN CENTRE GUIDANCE HAS PRESENTED FOR SEVERAL MODEL CYCLES
NOW...WITH A DEEPER LOW OVER THE NORTHERN PLAINS DAY 3...AND A
MUCH FASTER BREAKING DOWN OF THE SOUTHEAST RIDGE DAYS 6 AND 7.
THE 12Z/27 DETERMINISTIC ECMWF KEEPS THE POLAR FRONT HUNG UP OVER
WESTERN OHIO DAY 6...WITH THE GEM GLOBAL AND UKMET PUSHING IT
SOUTHWARD THROUGH THE CENTRAL APPALACHIANS BY THAT TIME. WILL
CONTINUE TO BANK ON THE TENACITY OF THE SOUTHEAST RIDGE IN THE
EUROPEAN SOLUTIONS.





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102. IKE
12Z ECMWF...
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Aqua/AMSR-E SST Anomalies for April 26th:




Same map 10-days earlier, April 16th:





A couple interesting things to notice here...

1. The MDR continues to get hotter relative to normal.

2. The belt of cold water anomalies north of the MDR had started to fade a couple weeks ago but has since revived and become solidly blue again.

3. Cold SST anomalies are now showing up in the equatorial Pacific between 160W and 130W, signalling that the complete death of the El Nino is very very close now.

4. A cool tongue of water is now showing up in the Gulf of Guinea (armpit of Africa) that wasn't there 10 days ago. Should this trend continue, it would confirm the Euro summer forecast and defy the CFS.
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That should be greetings.

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BRRRRRR


Frost Advisory

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
216 PM EDT TUE APR 27 2010

...FROST EXPECTED TONIGHT...

.FROST WILL BE WIDESPREAD LATE TONIGHT...THE RESULT OF CLEAR
SKIES AND LIGHT WINDS FROM HIGH PRESSURE BUILDING IN FROM CANADA.

INZ021-028>031-035>049-051>057-060>065-071-072-280230-
/O.NEW.KIND.FR.Y.0004.100428T0900Z-100428T1200Z/
CARROLL-WARREN-TIPPECANOE-CLINTON-HOWARD-FOUNTAIN-MONTGOMERY-
BOONE-TIPTON-HAMILTON-MADISON-DELAWARE-RANDOLPH-VERMILLION-PARKE-
PUTNAM-HENDRICKS-MARION-HANCOCK-HENRY-VIGO-CLAY-OWEN-MORGAN-
JOHNSON-SHELBY-RUSH-SULLIVAN-GREENE-MONROE-BROWN-BARTHOLOMEW-
DECATUR-JACKSON-JENNINGS-
INCLUDING THE CITIES OF...LAFAYETTE...FRANKFORT...KOKOMO...
CRAWFORDSVILLE...ANDERSON...MUNCIE...INDIANAPOLIS...TERRE HAUTE...
SHELBYVILLE...BLOOMINGTON...COLUMBUS...SEYMOUR
216 PM EDT TUE APR 27 2010

...FROST ADVISORY IN EFFECT FROM 5 AM TO 8 AM EDT WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN INDIANAPOLIS HAS ISSUED A FROST
ADVISORY...WHICH IS IN EFFECT FROM 5 AM TO 8 AM EDT WEDNESDAY.

THOUGH FROST WILL BE WIDESPREAD...IT IS NOT EXPECTED TO BE HEAVY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FROST ADVISORY MEANS THAT FROST IS EXPECTED AND SENSITIVE OUTDOOR
PLANTS MAY BE KILLED IF LEFT UNCOVERED.

&&

$$
DRT




Member Since: June 28, 2006 Posts: 25 Comments: 8418
Quoting alexhurricane1991:
Hey kimoskee!


Greeting from Jamaica.

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Hey kimoskee!
Member Since: April 8, 2010 Posts: 15 Comments: 2572
Quoting SomeRandomTexan:
Has anyone heard anything from weather456?


His last blog was a farewell to the blogs, at least for now, as he is having a child and he has new priorities. He will definitely be greatly missed this year.
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Quoting alexhurricane1991:
Wow blog is dead.


Not dead. Resting. :-D
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Has anyone heard anything from weather456?
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Comparisons with the day before TropicalStorm Arlene began forming on 8June2005

26Apr2010

7Jun2005

26Apr2010

7Jun2005

26Apr2010
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Wow blog is dead.
Member Since: April 8, 2010 Posts: 15 Comments: 2572
Wow temperatures in the atlantic are rising daily. I have a feeling that it will be a very interesting hurricane season
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@71 From Levi32

I have been watching that midwest setup for 2 days as Im smack dab in the middle of it. Only thing I am waiting for now, is the jetstream forcast (the tell-tale horse shoe if you will) for friday. If it has a deep enough dive south it will be rather sporty in my area.

I definately agree, it will probably be moderate to high by Friday.
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Quoting winter123:
12z gfs at 162 hours - stalled near gulf coast.


Check out the surge of moisture from South America! And they have big Cricket 20/20 match in Guyana there this weekend! Will that be the low that forms near the Lesser Antillies??
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Lots of earthquakes in iceland, the largest of which just of the Greenland coast at magnitude 4.5.


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Quoting winter123:
12z gfs at 162 hours - stalled near gulf coast.



Dont know bout dat Lil Blip in the Se..but that Big ol 975MB Low up in the Neast is definitely Impressive
Member Since: July 3, 2005 Posts: 437 Comments: 134781
SPC
Current Convective Outlooks
Member Since: July 3, 2005 Posts: 437 Comments: 134781

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Dr. Masters co-founded wunderground in 1995. He flew with the NOAA Hurricane Hunters from 1986-1990. Co-blogging with him: Bob Henson, @bhensonweather

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