Summer in March, 2012, draws to a close

By: Dr. Jeff Masters , 4:54 PM GMT on March 23, 2012

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The most incredible spring heat wave in U.S. and Canadian recorded history is finally drawing to a close today, after a ten-day stretch of unprecedented record-smashing intensity. Since record keeping began in the late 1800s, there have never been so many spring temperature records broken, and by such a large margin. Airports in fifteen different states have set all-time records for March warmth, which is truly extraordinary considering that the records were set in the middle of the month, instead of the end of the month. The 29.2°C (85°F) measured at Western Head, Nova Scotia yesterday was the third warmest temperature ever recorded in Canada in March, according to Environment Canada and weather records researcher Maximiliano Herrera (top two records: 31.1°C at Alberini Beaver Creek BC on March 29th 1926, and 29.4°C in 1921 at Wallaceburg.) Michigan's all-time record for March warmth was toppled on Wednesday, when the mercury hit 90°F at Lapeer. The previous record, 89° at Lapeer in 1910, was matched at three stations yesterday--Ypsilanti, Dearborn, and Lapeer. The duration, areal size, and intensity of the Summer in March, 2012 heat wave are simply off-scale, and the event ranks as one of North America's most extraordinary weather events in recorded history. Such a historic event is difficult to summarize, and in today's post I will offer just a few of the most notable highlights.


Figure 1. Clear skies over the Eastern U.S. caused by a blocking ridge of high pressure on March 21, 2012, are apparent in this visible satellite image. The comma-shaped cloud pattern over the Central U.S. is associated with a "cut-off" low pressure system. This low is moving over the Eastern U.S. today through Saturday, and will bring an end to "Summer in March" over the U.S. and Canada. Image credit: NOAA's Environmental Visualization Lab, and modified by Andrew Freedman of Climate Central.

Low temperatures beating previous high temperature records for the date
I've never seen a case where the low temperature for the date beat the previous record high. This happened on at least four occasions during "Summer in March, 2012":

The low temperature at Marquette, Michigan hit 52° on March 21, which was 3° warmer than the previous record high for the date.

The low at Mt. Washington, NH on March 21 (44°) beat the previous record high for the date (43°.)

The low temperature for International Falls, Minnesota on March 20 bottomed out at 60°F, tying the previous record high for the date.

The low temperature in Rochester, Minnesota on March 18 was 62°F, which beat the previous record high for the date of 60°.

Breaking all-time April records for warmth in March
Not only did many locations in Canada set records for their all-time warmest March day during "Summer in March, 2012", a number also broke their record for warmest April day:

St. John, New Brunswick hit 27.2°C (81°F) on March 21. Previous March record: 17.5°C on March 21, 1994. April record: 22.8°C.

Kejimkujik Park, Nova Scotia hit 27.9°C on March 21. Previous March record: 22.5°C on March 30, 1986. April record: 25°C on April 27, 1990.

Yesterday, I reported that Halifax, Nova Scotia hit 27.2°C (81°F) on March 22, 2012. Previous March record: 25.8° set the previous day. April record: 26.3°C, set on April 30, 2004. However, Rob Paola, a meteorologist with Environment Canada's Prairie and Arctic Storm Prediction Center in Winnipeg, Manitoba, wrote to tell me that Halifax did not break its April record: In fact, Halifax recorded a temperature of 29.5°C on April 28, 2009. For some reason, that stat does not show up on EC's normal/extremes climate site for Halifax, which only has data up to 2006 for extremes. More details on my blog at http://robsobsblog.blogspot.ca/

Breaking daily temperature records by more than 30°F
It is exceptionally rare for a weather station with a 50+ year period of record to break a daily temperature record by more than 10°F. During "Summer in March, 2012", beating daily records by 10° - 20°F was commonplace, and many records were smashed by over 20°. Two stations broke records by more than 30°F, which is truly surreal. Western Head, Nova Scotia hit 29.2°C (85°F), yesterday, breaking their previous record for the date (10.6°C in 1969) by 18.6°C (33°F.) Yesterday's high temperature was 24°C (44°F) above average. Pellston, Michigan in the Northern Lower Peninsula--dubbed "Michigan's Icebox", since it frequently records the coldest temperatures in the state--hit 85° on March 21. This broke the previous record for the date (53° in 2007) by 32°, and was an absurd 48°F above average.

Breaking daily temperature records nine consecutive days or more
It is extremely rare for stations with a 50+ year period of record to break a daily high temperature record for seven or more days in a row. The longest such streak of consecutive high temperature records at International Falls, Minnesota, was a 5-day period March 3 - 7, 2000. The city has tied or broken their high temperature for the date ten consecutive days, as of yesterday. This streak will likely end today, as the high is predicted to be 60 - 65, and the record high for the date is 66. Chicago, Illinois has tied or broken their daily high temperature record the past nine days in a row. This ties the nine-day streak of record highs set on August 26 - September 3, 1953. Other cites that have set daily high temperature records the past nine days in a row include Fort Wayne and South Bend, Indiana. Numerous cities have broken high temperature records on seven consecutive days during "Summer in March, 2012", including Gaylord, Pellston, and Traverse City in Michigan.


Figure 2. All-time high temperature records set in March 2012 for the U.S. The grey icons show locations where the March record was broken on multiple days. Image taken from wunderground's new record extremes page, using data from NOAA's National Climatic Data Center.

The big picture: the impacts of "Summer in March, 2012"
I've always said living in Michigan would be much more bearable if we could just get rid of March. March weather here is always horrible, with brutal cold, high winds, damaging ice storms, heavy snow, interminable cloudy stretches with no sun, all interspersed with a few teasing warm spells. Well, this year, I got my wish. This March, we started with twelve days of April weather, followed by ten days of June and July weather, with nine days of May weather predicted to round out the month. This has been a huge benefit to the economy--vastly reduced heating costs, no snow removal bills, and far fewer traffic accidents due to icy roads. However, there is major downside to the "Summer in March, 2012" heat wave. The growing season is now in full swing, five weeks early. A damaging freeze that will severely impact the fruit industry and other sensitive plants is very likely. Indeed, the forecast calls for lows in the upper 20s in the cherry-growing region of Michigan near Traverse City on Monday night. The exceptional March warmth has also melted all the snow in the northern U.S. and southern Canada, drying out the soils and setting the stage for a much warmer than average summer, and an increased chance of damaging drought conditions. The early loss of snowpack will also likely cause very low flow rates in the major rivers in late summer and early fall, reducing the amount of water needed for irrigation of crops. Low flows may also cause problems for navigation, limiting commercial barge traffic on Midwest rivers.

Links
Andrew Freedman of Climate Central interviewed a number of climate scientists who are experts in studying the link between extreme weather events and climate change for his post, Global Warming May Have Fueled March Heat Wave Odds.

Wunderground's weather historian Christopher C. Burt will be posting a more comprehensive summary of the "Summer in March, 2012" heat wave this weekend.

Have a great weekend, everyone, and I'll be back Monday with a new post. I expect I'll be hard at work this weekend, mowing my lawn for the first time ever in March!

Jeff Masters

2012 03 22 Neighbor's Magnolia Tree drops its blossoms (gatyamgal)
Because of our week of record breaking Temps here in Bettendorf, IA, the neighbor's tree bloomed and lost its blossoms 3 weeks early. What will April bring?
2012 03 22 Neighbor's Magnolia Tree drops its blossoms
Spring Landscape (thebige)
Spring Landscape
Jefferson Memorial (KEM)
Cherry blossoms in Washington DC.
Jefferson Memorial

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652. wxmod
Quoting nigel20:

Super volcanoes are more likely to cause major cooling as the volume of super volcanoes are many times that of the average volcanoes...the amount of ash emitted by these volcanoes is enough to blanket largeamount of earth's...the thick blanket off ash would reduce the amount of heat reaching the surfaceLink


The huge difference between a volcano and fossil fuel burning is (1) we don't have a choice and (2) we do. People need to be responsible citizens and quit worrying so much about their status quo oil money.
Member Since: October 4, 2011 Posts: 0 Comments: 1738
Quoting Skyepony:
That question about why the weekend occurrence. I've seen studies about the weekly release patterns of pollutions causing a tendency toward weekly patterns of rain in different seasons. I think during the summer the SE tends rainier mid weeks than weekends. Here it is.


Skye,
That's an interesting article, and the premise makes sense. I wonder, though, if the really big storms tend to get push to the weekends, when the particulate matter is probably near its high? I was reviewing the Skywarn activations we've had in Alabama over the past three years, and 74% occured between 2200 Friday and 1900 Sunday. I haven't calculated the rainfall by day during the same period, but there's no doubt we get our strongest storm at the end of the week rather than the middle. Since last April, in partular, I've had about half my weekends ruined by having to sit at the radio as a Skywarn net controller, communicate with the NWS, and keep an eye on the radar. We've even had church services cancelled, which never happens here. :) Of course, Alabama is not a high production state for particulate pollution, so that mat have some effect, but percentage of weekend activations has been striking.
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Quoting Cyclone2012:


Grotha, ^_^. How are ya, sir?


Gee, I wonder who you could be? que bola?
Member Since: July 17, 2009 Posts: 69 Comments: 25369
Quoting yqt1001:


From now and on whenever we are on the eve of something I'm going to picture you saying "So?".

Something like: "Humanity on verge of massive war between SUPERPOWER1 and SUPERPOWER2" "So?" came to my mind first. :P
its called denial its one of the stages of accepting the truth
Member Since: July 15, 2006 Posts: 169 Comments: 53296
Possible tornado headed for Lynchburg, Virginia. If there is a tornado on the ground it will likely be imbedded in some very heavy rain and hail.
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Quoting BobWallace:


There is one argument that a series of volcanoes over a few years helped create or created the Little Ice Age.

By keeping particulates in the atmosphere the Earth was cooled which allowed significant Arctic ice growth which brought about a multi-hundred year cooling period.

Not yet settled science....

Super volcanoes are more likely to cause major cooling as the volume of super volcanoes are many times that of the average volcanoes...the amount of ash emitted by these volcanoes is enough to blanket large amount of earth's atmosphere...the thick blanket off ash would reduce the amount of heat reaching the surface
Link
Member Since: November 6, 2010 Posts: 11 Comments: 7852
How many more days until Hurricane season?
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MESOSCALE DISCUSSION 0351
NWS STORM PREDICTION CENTER NORMAN OK
0503 PM CDT SAT MAR 24 2012

AREAS AFFECTED...PORTIONS CENTRAL/S-CENTRAL/SERN VA...ERN NC.

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 242203Z - 250030Z

SVR TSTM POTENTIAL MAY SPREAD ACROSS THIS REGION FROM W-E OVER NEXT
FEW HOURS...IN ASSOCIATION WITH TWO PRIMARY REGIMES...

1. LOOSELY ORGANIZED BELT OF SCATTERED TO NUMEROUS TSTMS EVIDENT AT
2145Z FROM ERN PORTIONS SC/NC BORDER NEWD ACROSS ERN PORTIONS WW 108
INTO NERN NC NE OF WW. AIR MASS E OF THIS ACTIVITY APPEARS MRGLLY
FAVORABLE...THANKS TO COMBINATION OF
A. EARLIER/PERSISTENT CLOUDS AND PRECIP AND
B. INLAND PENETRATION OF SEA BREEZE AIR
...EACH OF WHICH SUBSTANTIALLY HAS LIMITED BOUNDARY-LAYER LAPSE
RATES AND DESTABILIZATION. STILL...MODIFIED FCST SOUNDINGS SUGGEST
LOW-LEVEL THETAE WILL BE SUFFICIENT TO OFFSET WEAK MIDLEVEL LAPSE
RATES AND SUPPORT MLCAPE 200-800 J/KG AHEAD OF THIS ACTIVITY.
DEEP-LAYER SHEAR WILL CONTINUE TO WEAKEN WITH EWD EXTENT...SO
PRIMARY MODE WILL REMAIN MULTICELLULAR AND CLUSTERED WITH THIS
ACTIVITY. SOME POTENTIAL EXISTS FOR AGGREGATE COLD-POOL GENERATION
RELATED TO CLUSTER MOVING NEWD OUT OF SC INTO SERN NC...WHICH MAY
PRODUCE FORCED ASCENT OF MRGLLY FAVORABLE AREA ACROSS COASTAL
PLAIN/TIDEWATER OF NC. OTHERWISE...ISOLATED DOWNBURSTS WITH MOST
INTENSE/EMBEDDED CELLS WILL POSE PRIMARY DAMAGING GUST POTENTIAL.

2. BETTER-ORGANIZED ARC OF CONVECTION NOW TRANSLATING EWD ACROSS ERN
WV...WRN VA...AND WRN CAROLINAS IN WWS 105-108. MORE FAVORABLE
PARAMETERS ARE EVIDENT FOR BOTH DEEP-LAYER SHEAR AND BOUNDARY-LAYER
INSTABILITY. OUTFLOW BOUNDARY FROM EARLIER CONVECTION WAS ANALYZED
OVER MADISON/BUCKINGHAM/CAMPBELL/BEDFORD COUNTIES VA. RELATED
ENHANCEMENTS TO LOW-LEVEL LIFT/SHEAR/VORTICITY APPEAR TO BE AIDING
MESOCYCLONE PRODUCTION/MAINTENANCE WITH SWRN VA CONVECTION
INTERACTING WITH IT. ONE OFFSETTING FACTOR IS THAT STORM MOTIONS
MAY OUTPACE EWD TRANSLATION OF FAVORABLE SHEAR. ANOTHER IS THAT
LOW-LEVEL LAPSE RATES PROBABLY ARE PAST PEAK GIVEN COMBINATION OF
A. LOSS OF INSOLATION/DIABATIC SFC HEATING AND
B. INCREASING ANTECEDENT MLCINH WITH NEWD EXTENT OVER NERN NC AND
SERN VA RELATED TO STABILIZATION BY EARLIER CONVECTION.
STILL...NARROW SWATH OF CENTRAL/SRN VA AND NERN NC AHEAD OF ONGOING
WWS MAY BECOME FAVORABLE FOR A FEW HOURS BEFORE ACTIVITY WEAKENS.

..EDWARDS.. 03/24/2012
Member Since: July 6, 2010 Posts: 113 Comments: 31463
Quoting TropicalAnalystwx13:

So?


From now and on whenever we are on the eve of something I'm going to picture you saying "So?".

Something like: "Humanity on verge of massive war between SUPERPOWER1 and SUPERPOWER2" "So?" came to my mind first. :P
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Recent Rocky Mount hailstorm:
http://www.youtube.com/watch?v=zkwY57spunY
I've just found it by Twitter ...
Good evening everybody!
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Quoting wxmod:



There are a lot of other great reasons to change away from carbon based fuel.


True, but the list is too long to post on a single blog. ;-)

One primary reason is that they are not an infinite energy source. As their scarcity becomes more apparent so will their price climb accordingly.
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Quoting wxmod:

Washington should have some pretty strong storms tonight.

So?
Member Since: July 6, 2010 Posts: 113 Comments: 31463
640. wxmod
Quoting hurricanehunter27:
What do you mean by that?

Washington should have some pretty strong storms tonight.
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Quoting wxmod:
Interesting thunderstorms today. I wonder if they will change the climate debate?
What do you mean by that?
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strong rtn flow in 72 hrs
Member Since: July 15, 2006 Posts: 169 Comments: 53296
637. wxmod
Interesting thunderstorms today. I wonder if they will change the climate debate?
Member Since: October 4, 2011 Posts: 0 Comments: 1738
Member Since: July 15, 2006 Posts: 169 Comments: 53296
Member Since: July 15, 2006 Posts: 169 Comments: 53296
Member Since: July 15, 2006 Posts: 169 Comments: 53296
633. Skyepony (Mod)
That question about why the weekend occurrence. I've seen studies about the weekly release patterns of pollutions causing a tendency toward weekly patterns of rain in different seasons. I think during the summer the SE tends rainier mid weeks than weekends. Here it is.
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Member Since: July 15, 2006 Posts: 169 Comments: 53296
Virginia. I believe the one that had been near Rocky Mount.
Member Since: April 29, 2006 Posts: 151 Comments: 18360
i've been so impressed by this cut off low! curious to see how long it maintains itself entering the Atlantic. it is an indicator of the balancing forces in the overall system of northern hemisphere weather :)
a joy to watch, but bummer to see the havoc wreaked :(
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629. Skyepony (Mod)
Oh the fatal was yesterday the hail today..
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628. Skyepony (Mod)
0651 PM TSTM WND DMG 3 SSW GASTONIA 35.21N 81.19W
03/23/2012 GASTON NC LAW ENFORCEMENT

*** 1 FATAL, 2 INJ *** GASTONIA PD REPORTED A ROTTED TREE
FELL ON A CAR ON STAGECOACH ROAD...KILLING ONE PERSON AND
INJURING TWO. AT LEAST ONE OF THE INJURIES IS CRITICAL.
NO OTHER WIND DAMAGE REPORTED IN THE COUNTY.


&&


1" hail in Rosman, NC.
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Quoting GeorgiaStormz:


which one? there are 3 now, the rocky mountain one?
near Smith Mountain Lake to northeast of Rocky Mt.
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Quoting nigel20:

I think the possibility of an Ice Age occuring would be dependent on the eruption of a super volcano....say Yellow Stone, but I don't know if such an eruption would occur anytime soon....Just my simple opinion


At this point, it would take an event of that magnitude. Even if the THC in the Atlantic did a full stop (worst case), only regional cooling would occur. Namely, norther Europe would get the weather that Alaska gets.

But at the same time, the heat that wasn't going to jolly ol' England would end up hanging around the tropical Atlantic basins. Needless to say, this would probably create some pretty interesting weather changes.

The main point being, in order for there to be an ice age the Earth's net energy balance has to become negative. Changing ocean currents aren't going to do that. That will just redistribute the energy in a different way.
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Quoting Bluestorm5:
Hearing there's a "large tornado on ground" in that Virginia tornado warned cell.

Umm... Which one? XD
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Quoting Bluestorm5:
Hearing there's a "large tornado on ground" in that Virginia tornado warned cell.


which one? there are 3 now, the rocky mountain one?
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Member Since: July 15, 2006 Posts: 169 Comments: 53296
Hearing there's a "large tornado on ground" in that Virginia tornado warned cell.
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Quoting BobWallace:
Just ran across this statement on Skeptical Science...

What is known, however, is that natural global warming periods during the Earth's deep past have been severe enough to cause hurricanes with so much force they've left permanent scars on the ocean floor.

One of the questions that I have unanswered is whether a warming climate will increase or decrease hurricane strength. Looks like there might be some data for increasing....

http://www.skepticalscience.com/Over-the-tipping- point.html


Hurricane frequency is eventually expected to drop, but hurricane intensity is expected to increase.

So the blog will be slower, but more intense. ;)
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Quoting GeorgiaStormz:


was that trail of tornado reports from 1 storm, was it a long track tornado? I missed it.

I think it was the same storm with several brief tornadoes.
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Quoting biowizard:

But what effect would El Nino have on all this, I wonder?! LOL!!
El-Nino created the Universe in the first place. :)
Member Since: September 27, 2007 Posts: 1 Comments: 20507


was that trail of tornado reports from 1 storm, was it a long track tornado? I missed it.
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Quoting SPLbeater:
that cant be rocky mount NC is it?

No. Rocky Mount, NC is fine. Just some storms to the east. Rocky Mount, Virginia is where the tornado warning is near.
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Quoting hydrus:
TABLE OF TERRORS
The following data about Near-Earth Objects are from the Anglo-Australian Observatory's research astronomer Duncan Steel's book Rouge Asteroids and Doomsday Comets.

About 2,000 objects massive enough (1 km diameter) to cause global catastrophe are known to cross Earth's orbit. Such an impacting object would wipe out 25% of humanity.
About 10,000 objects of 500 m size cross Earth's orbit.
About 300,000 objects of 100 m size cross Earth's orbit.
About 150 million objects of 10 m size cross Earth's orbit.
Some 70% of potential impactors are asteroids; the rest are comets.
About 50% of the Earth-crossing asteroids most likely are extinct or dormant comets.



FREQUENCY OF IMPACTORS:
Pea-size meteoroids - 10 per hour
Walnut-size - 1 per hour
Grapefruit-size - 1 every 10 hours
Basketball-size - 1 per month
50-m rock that would destroy an area the size of New Jersey - 1 per 100 years
1-km asteroid - 1 per 100,000 years
2-km asteroid - 1 per 500,000 years
A "nemesis" parabolic comet impactor would give us only a 6-month warning.

But what effect would El Nino have on all this, I wonder?! LOL!!
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Quoting Bluestorm5:
well, it's Rocky Mount, VA right? Rocky Mount, NC isn't too far from me.


it aint NC uz there aint nothin over NC Rocky Mount at the moment.
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Quoting Bluestorm5:
well, it's Rocky Mount, VA right? Rocky Mount, NC isn't too far from me.


He didnt say..I have been to both Rocky Mount VA and NC..You guys should be able to tell though by the conditions outside if its your neck of the woods..be safe!
Member Since: August 19, 2006 Posts: 13 Comments: 14461
Little earthquake in Hawaii

000
SEHW70 PHEB 242050
EQIHWX
HIZ001>003-005>009-012>014-016>021-023>026-242250 -

TSUNAMI SEISMIC INFORMATION STATEMENT NUMBER 1
NWS PACIFIC TSUNAMI WARNING CENTER EWA BEACH HI
1050 AM HST SAT MAR 24 2012

TO - CIVIL DEFENSE IN THE STATE OF HAWAII

SUBJECT - LOCAL TSUNAMI INFORMATION STATEMENT

THIS STATEMENT IS FOR INFORMATION ONLY. NO ACTION REQUIRED.

AN EARTHQUAKE HAS OCCURRED WITH THESE PRELIMINARY PARAMETERS

ORIGIN TIME - 1047 AM HST 24 MAR 2012
COORDINATES - 19.9 NORTH 155.1 WEST
LOCATION - IN THE HILO REGION OF THE BIG ISLAND
MAGNITUDE - 4.8

EVALUATION

NO TSUNAMI IS EXPECTED. REPEAT. NO TSUNAMI IS EXPECTED.
HOWEVER...SOME AREAS MAY HAVE EXPERIENCED SHAKING.

THIS WILL BE THE ONLY STATEMENT ISSUED FOR THIS EVENT UNLESS
ADDITIONAL DATA ARE RECEIVED.

$$

Member Since: February 11, 2012 Posts: 82 Comments: 7614
Quoting SPLbeater:
that cant be rocky mount NC is it?
I looked up. It's Rocky Mount, Virginia.
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611. wxmod
Quoting Some1Has2BtheRookie:


I made the statement of, "Drill, Baby, Drill". I was not directing at you or anyone else. What I was saying is that if the AGWT is disproved, the Laws of Physics turned upside down and Chemistry proven useless concerning the AGWT and we discover that the burning of fossil fuels are not a detriment to our climate then, by all means, "Drill, Baby, Drill!". I would be in full support of it, if all the evidence is proven wrong concerning the burning of fossil fuels.



There are a lot of other great reasons to change away from carbon based fuel.
Member Since: October 4, 2011 Posts: 0 Comments: 1738
that cant be rocky mount NC is it?
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Quoting ncstorm:
From Henry Margusity:
Inflow jet just showed up on radar coming into the Rocky Mount storm. That means new hook and tornado is developing. #tornado

Rocky Mount need to take cover
well, it's Rocky Mount, VA right? Rocky Mount, NC isn't too far from me.
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Quoting SPLbeater:
i cancelled my GR2analyst trial cuz i couldnt git it to work.

Really? I thought it was a great product when I was using the trial. I'm sad my trial just expired.
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How strong is the rotation near Stuart? I can't tell from NWS Blacksburg radar.
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From Henry Margusity:
Inflow jet just showed up on radar coming into the Rocky Mount storm. That means new hook and tornado is developing. #tornado

Rocky Mount need to take cover
Member Since: August 19, 2006 Posts: 13 Comments: 14461
i cancelled my GR2analyst trial cuz i couldnt git it to work.
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Quoting TropicalAnalystwx13:
Twins:


The storm near Rocky Mount is likely producing very large hail. That's a beast of a storm.
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TABLE OF TERRORS
The following data about Near-Earth Objects are from the Anglo-Australian Observatory's research astronomer Duncan Steel's book Rouge Asteroids and Doomsday Comets.

About 2,000 objects massive enough (1 km diameter) to cause global catastrophe are known to cross Earth's orbit. Such an impacting object would wipe out 25% of humanity.
About 10,000 objects of 500 m size cross Earth's orbit.
About 300,000 objects of 100 m size cross Earth's orbit.
About 150 million objects of 10 m size cross Earth's orbit.
Some 70% of potential impactors are asteroids; the rest are comets.
About 50% of the Earth-crossing asteroids most likely are extinct or dormant comets.



FREQUENCY OF IMPACTORS:
Pea-size meteoroids - 10 per hour
Walnut-size - 1 per hour
Grapefruit-size - 1 every 10 hours
Basketball-size - 1 per month
50-m rock that would destroy an area the size of New Jersey - 1 per 100 years
1-km asteroid - 1 per 100,000 years
2-km asteroid - 1 per 500,000 years
A "nemesis" parabolic comet impactor would give us only a 6-month warning.
Member Since: September 27, 2007 Posts: 1 Comments: 20507
Twins:

Member Since: July 6, 2010 Posts: 113 Comments: 31463

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Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.