Extreme storms and extreme heat hit the U.S.

By: Dr. Jeff Masters , 5:50 PM GMT on June 30, 2012

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A violent line of organized severe thunderstorms called a derecho swept across the U.S. from Illinois to Virginia on Friday, damaging houses, toppling trees, bringing down power lines. The storms killed six people in Virginia, two in New Jersey, and one in Maryland, and left at least 3.4 million people without power. The thunderstorms in a derecho (from the Spanish phrase for "straight ahead") create violent winds that blow in a straight line. The traditional definition of a derecho is a thunderstorm complex that produces a damaging wind swath of at least 240 miles (about 400 km), featuring a concentrated area of thunderstorm wind gusts exceeding 58 mph (93 km/hr.) A warm weather phenomenon, derechos occur mostly in summer, especially June and July in the Northern Hemisphere. They can occur at any time of the year and occur as frequently at night as in the daylight hours. As seen on our wundermap with the "go back in time" feature turned on, Friday's derecho began near Chicago in the early afternoon, then marched east-southeast, peaking in intensity over Virginia and Washington D.C. on Friday evening. The derecho was unusually intense due to the extreme heat, which helped create an unstable atmosphere with plenty of energy to fuel severe thunderstorms.


Figure 1. Radar image from our wundermap with the "go back in time" feature turned on for 11 pm EDT Friday June 29, 2012, showing the derecho over Washington D.C. and Baltimore. Click on the "hour" button above the wundermap to advance the time by one hour to watch the progress of the derecho across the country.


Figure 2. NOAA's Storm Prediction Center (SPC) logged 871 reports of damaging winds on Friday. Twenty one of these reports were for winds over 80 mph. The highest wind gust was in Oswego, Illinois: 92 mph.



Figure 3. A dramatic change in the weather in Buckeye land: the temperature at Ohio State University in Columbus, Ohio dropped from 97°F to 68° after passage of Friday's derecho. The storm brought a wind gust of 82 mph to campus, and 0.86" of rain.

Historic heat wave topples Dust Bowl-era extreme heat records
A historic heat wave on a scale and intensity not seen in the U.S. since the great heat waves of the 1930s Dust Bowl era set new all-time heat records for at least ten major cities Friday. According to wunderground's weather historian Christopher C. Burt, fifteen of the 303 major cities he maintains records for on the wunderground extremes page have set all-time heat records in the past four days. The only year with more all-time heat records is 1936, when 61 cities set all-time heat records. In 2011, which had the 2nd warmest summer in U.S. history, only ten of the 303 cities set all-time heat records during the entire summer. With the the hottest month of the year (July) still to come, 2012 threatens to rival the great Dust Bowl summer of 1936 for extreme heat.

All-time records for any date tied or broken on Friday:

109° Nashville, TN (old record 107° 7/28/1952
109° Columbia, SC (old record 107° on two previous occasions)
109° Cairo, IL (old record 106° on 8/9/1930)
108° Paducah, KY (ties same on 7/17/1942
106° Chattanooga, TN (ties same on 7/28/1952)
105° Raleigh, NC (ties same on 8/21/2007 and 8/18/1988)
105° Greenville, SC (old record 104° 8/10/2007 although 106° was recorded by the Signal Service in July 1887)
104° Charlotte, NC (ties same on 8/9 and 10/2007 and 9/6/1954)
102° Bristol, TN (ties same on 7/28/1952-this site now known as `Tri-State Airport')
109° Athens, GA. This is just 1° shy of the Georgia state record for June of 110° set at Warrenton in 1959.

All-time state June heat records set Friday:

113° Smyrna, TN (old record 110° in Etowah in June 1936)
109° Cairo, IL (old record 108° in Palestine in June 1954)

Also of note: Atlanta, GA hit 104° (its all-time June record), and just 1° shy of its all-time record of 105° set on 7/17/1980. The forecast for Atlanta on Saturday calls for a high of 105°F, which would tie for the hottest day in the city's history.

Wunderground's weather historian Christopher C. Burt has a new post called The Amazing June Heat Wave of 2012 Part 1: The West and Plains June 23 - 27 summarizing the early portion of this week's historic heat wave. He plans to make a follow-up post on Sunday summarizing the records set on Friday and Saturday.

Relatively quiet in the Atlantic
An area of heavy thunderstorms, associated with an upper level low pressure system, has developed in the Gulf of Mexico along the Texas coast. This disturbance will probably move ashore over Texas before development into a tropical depression can occur, and NHC is giving it a 0% chance of development. The tropical wave approaching the Lesser Antilles (Invest 97L) has dissipated due to dry air, and is no longer a threat. None of the reliable computer models are developing anything during the next seven days.

Jeff Masters

Chicago Shelf (LarrySmit)
Chicago Shelf
Summer Heat (gardner48197)
Summer Heat
Smokey Clouds (LarrySmit)
Asperatus Clouds
Smokey Clouds
And the Sky Opened Up! (webgal)
Much needed thunderstorms came through west-central Illinois late this evening. The lightning was absolutely incredible!
And the Sky Opened Up!

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It's still early, but they don't appear to be really congealing into an organized MCS at the moment thankfully. That could change though.

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New watch.

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Storms are starting to pop up now Southern NC and SC..

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Quoting LargoFl:


Well... I live 10-20 miles SW of that dot. Looks like all the storms are staying to my south, let's hope it remains that way.
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Here's another major storm. In NW Indiana.

WUUS53 KLOT 011811
SVRLOT
INC073-089-127-011915-
/O.NEW.KLOT.SV.W.0070.120701T1811Z-120701T1915Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE IL
111 PM CDT SUN JUL 1 2012

THE NATIONAL WEATHER SERVICE IN CHICAGO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
NORTHERN JASPER COUNTY IN NORTHWEST INDIANA...
EASTERN LAKE COUNTY IN NORTHWEST INDIANA...
PORTER COUNTY IN NORTHWEST INDIANA...

* UNTIL 215 PM CDT

* AT 108 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE HURRICANE FORCE WINDS IN EXCESS OF 80 MPH.

THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM LAKE STATION
TO FOREST CITY...AND MOVING EAST AT 35 MPH.

AT 103 PM CDT WINDS OF 80 MPH WERE REPORTED IN GRIFFITH WITH
THESE STORMS.

* SEVERE THUNDERSTORMS WILL BE NEAR...
OGDEN DUNES...WHEELER...PORTAGE AND LAKES OF THE FOUR SEASONS
AROUND 115 PM CDT.
BURNS HARBOR...BOONE GROVE AND SOUTH HAVEN AROUND 120 PM CDT.
PORTER...LINCOLN HILLS AND CHESTERTON AROUND 125 PM CDT.
MALDEN...VALPARAISO AND KOUTS AROUND 130 PM CDT.
DUNNS BRIDGE AROUND 135 PM CDT.

OTHER LOCATIONS AFFECTED...
INDIANA DUNES STATE PARK...INDIANA UNIVERSITY NORTHWEST...PORTER
COUNTY FAIRGROUNDS...SOUTH SHORE RAIL-CATS BASEBALL...VALPARAISO
UNIVERSITY...


PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST
FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4119 8727 4122 8728 4119 8733 4118 8735
4163 8734 4163 8722 4164 8717 4166 8715
4165 8712 4167 8707 4169 8693 4120 8693
TIME...MOT...LOC 1810Z 265DEG 31KT 4159 8725 4121 8726
WIND...HAIL 80MPH 1.00IN

$$

LENNING






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Quoting TropicalAnalystwx13:
We have another super derecho setting up across almost the exact same area that got hit the other day.


UGH! Was kinda hoping for a break from the severe weather! Had a tornado pass too close for comfort to me yesterday evening, and the derecho Friday night, and the supercell Monday. Not to mention the triple digit heat.

I've had enough of severe weather and heat for a while...
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the next invest will be the tropical wave near 35 w. there is a pronouced cyclonic turning in the lower cloud field. it is also in a large moisture field where it will be able to nullify the dry air which caused the demise of 97L
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60 mph winds in Chicago.
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Quoting TropicalAnalystwx13:
They have no clue that wind gusts equivalent to a high end Category 1 hurricane are on the way.
I hope they all dont try to head into Mcdonalds!!
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Quoting MAweatherboy1:
12z GFS 156 hours... That storm is way up north but looks fully tropical...

If this went to verify it looks like almost all the systems are forming of non tropical origin , and its becoming a little boring to see just development near that part of the Atlantic.
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Quoting TropicalAnalystwx13:
They have no clue that wind gusts equivalent to a high end Category 1 hurricane are on the way.


its ok, they've got "rain ponchos" for sale...
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742. MZT
So far the forecast is just calling for 20%-30% chance of storms in NC. But with 5000 j/kg of CAPE, what does develop will be powerful
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564 GeorgiaStormz: Apparently northern Georgia can have wildfires if we have a prolonged dry period, since that is how our pine forests are supposed to be regurgitated.
I know that due to population, we haven't had controlled burns and stuff in populated areas(which are still quite wooded)...
...We still won't have a fire like Colorado's for another 100 years...


Might wanna rethink that.


564 GeorgiaStormz: ...This is how wooded Atlanta is should we have a long drought and major wildfire...I just don't see firefighters keeping up with an out of control blaze that starts just outside the metro Atlanta area

Interstate285 forms a huge firebreak surrounding Atlanta. And other wide freeways form spokes that break that circle into 9 regions; each surrounded by such major firebreaks.
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Quoting TropicalAnalystwx13:
wow some pic there, at least its not like the other night with a solid wall of red, straightline winds,the supercell was huge in size, this one4 true is strong but not nearly as big as the other night
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Quoting HurricaneHunterJoe:


What the hell does that mean? Looks bad? Are we doomed?..............lol


Nah, the sun is just mooning us. :)
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738. MZT
WU says 103 in Charlotte now. It's still 97 at my desk and 92 in the hallway.

Yesterday I ran the HVAC blower without the A/C and I think that was counterproductive. The venting is all in the attic, the registers point down from the ceiling. I was probably picking up attic heat and dispersing it through the living area.

Will just use floor fans and ceiling fans today.
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Quoting TropicalAnalystwx13:
MONTHLY TROPICAL WEATHER SUMMARY
NWS NATIONAL HURRICANE CENTER MIAMI FL
800 AM EDT SUN JUL 1 2012

FOR THE NORTH ATLANTIC...CARIBBEAN SEA AND THE GULF OF MEXICO...

TWO TROPICAL STORMS FORMED IN THE BASIN DURING MAY. WHILE IT IS NOT
UNUSUAL TO HAVE TROPICAL CYCLONES FORM BEFORE THE OFFICIAL START OF
THE HURRICANE SEASON...THERE ARE ONLY TWO OTHER YEARS...1887 AND
1908...WHEN TWO TROPICAL CYCLONES OCCURRED BEFORE 1 JUNE. TROPICAL
STORM BERYL MADE LANDFALL NEAR JACKSONVILLE BEACH FLORIDA EARLY ON
28 MAY...MAKING IT THE STRONGEST PRE-JUNE TROPICAL CYCLONE EVER TO
IMPACT THE UNITED STATES COASTLINE.

TWO TROPICAL CYCLONES FORMED IN THE BASIN DURING JUNE...HURRICANE
CHRIS AND TROPICAL STORM DEBBY. BASED ON A 30-YEAR AVERAGE FROM
1981 TO 2010...A NAMED STORM FORMS IN THE BASIN IN JUNE ABOUT ONCE
EVERY OTHER YEAR...WHILE A HURRICANE FORMS IN THE BASIN IN JUNE
ONLY ABOUT ONCE EVERY SEVEN OR EIGHT YEARS. ALSO...THE FORMATION OF
DEBBY ON 23 JUNE MARKED THE EARLIEST FORMATION OF FOUR NAMED STORMS
ON RECORD IN THE BASIN.

IN TERMS OF ACCUMULATED CYCLONE ENERGY...WHICH MEASURES THE COMBINED
STRENGTH AND DURATION OF TROPICAL STORMS AND HURRICANES...TROPICAL
CYCLONE ACTIVITY IN THE BASIN SO FAR THIS YEAR IS WELL ABOVE THE
1981-2010 AVERAGE...AND IS THE HIGHEST VALUE FOR ANY YEAR SINCE
1968.

REPORTS ON INDIVIDUAL CYCLONES...WHEN COMPLETED...ARE AT THE WEB
SITE OF THE NATIONAL HURRICANE CENTER...USE LOWER-CASE LETTERS...
HTTP://WWW.HURRICANES.GOV/2012ATLAN.SHTML

SUMMARY TABLE

NAME DATES MAX WIND (MPH)
------------------------------------------------- --
TS ALBERTO 19-22 MAY 60
TS BERYL 26-30 MAY 70
H CHRIS 19-22 JUN 75
TS DEBBY 23-27 JUN 60
------------------------------------------------- --


$$
HURRICANE SPECIALIST UNIT
This was an interesting snap shot of a start to a record breaking season.
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The Weekend Wonk: Measuring Sea Level in Detail

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SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 443
NWS STORM PREDICTION CENTER NORMAN OK
1220 PM CDT SUN JUL 1 2012

SEVERE THUNDERSTORM WATCH 443 IS IN EFFECT UNTIL 700 PM CDT
FOR THE FOLLOWING LOCATIONS

OHC003-011-021-023-037-039-057-065-091-107-109-11 3-125-135-137-
149-161-020000-
/O.NEW.KWNS.SV.A.0443.120701T1720Z-120702T0000Z/

OH
. OHIO COUNTIES INCLUDED ARE

ALLEN AUGLAIZE CHAMPAIGN
CLARK DARKE DEFIANCE
GREENE HARDIN LOGAN
MERCER MIAMI MONTGOMERY
PAULDING PREBLE PUTNAM
SHELBY VAN WERT
$$
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let's not forget all those hundreds of families whithout homes from the wildfires.
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This is what the North Atlantic Basin is doing right now,trying to find where the next invest will be.

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Quoting MAweatherboy1:

Wow... That's a recipe for disaster... Tens of thousands of people outside in a severe thunderstorm...

Agreed.
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Quoting TropicalAnalystwx13:
They have no clue that wind gusts equivalent to a high end Category 1 hurricane are on the way.


Amazing bird's eye cam view!
"Cubs eye Wrigley sweep of Astros

Published July 01, 2012
Sports Network

Travis Wood aims to win his third straight start today when the Cubs try to complete a sweep of the Houston Astros at Wrigley Field (today). -- The game starts at 1:20 CST

Read more: http://www.foxnews.com/sports/2012/07/01/cubs-eye- wrigley-sweep-astros/#ixzz1zOYFqc6h
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Quoting TropicalAnalystwx13:
They have no clue that wind gusts equivalent to a high end Category 1 hurricane are on the way.

Wow... That's a recipe for disaster... Tens of thousands of people outside in a severe thunderstorm...
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Quoting CaneHunter031472:


Ozone action day, LOL I'm inspired now. Going to Mow the yard.
I just finished. I actually feel like I saved the ozone by not waiting... The grass would have been longer tomorrow hence the mower would have had to work harder.
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.................................only 89 here, so come'on down! as the ads used to say,although its kinda terrible to think people have to come DOWN to Florida of all places..to COOL off..gee
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725. Skyepony (Mod)
Quoting Tribucanes:
Skyepony please tell me I don't need to be terribly worried about that. JK I'll google it, but that doesn't look good.


Most likely just a chance of a solar storm. Solar winds coming out of Coronal holes tend to be double normal & they don't loop back to the sun...but are released into the direction the hole is pointed (in this case earth).

Mid March we had a huge one opened up to a perfect triangle pointed at earth. Some said it was a Stargate.
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Quoting Patrap:

Jamaica was pretty luckily in 2005...Emily tracked along the south coast while Dennis tracked along the northern coast. We had quite a bit of flooding and landslides from both storms.
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Quoting ernesto2012:
wow that really sucks i was afraid of that with el nino getting stronger...we may not have another one all season...this hurricane season is going down the tubes in a hurry....
This the same clown!!!
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OMG ITS HOOOOT!!!!

Millen, GA
Fair

95 °F
(35 °C)
Humidity: 67 %
Wind Speed: SW 3 MPH
Barometer: 29.99"
Dewpoint: 82 °F (28 °C)
Heat Index: 120 °F (49 °C)

Visibility: 10.00 mi.
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716. etxwx
Quoting TropicalAnalystwx13:
Hurricane force wind gusts being reported in west Chicago.


There are a couple of chasers up in that area on tornadovideos.net.
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Quoting tazmaniad:


not cool to mow your lawn on ozone action day


Ozone action day, LOL I'm inspired now. Going to Mow the yard.
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100mph winds in Chicago? What could possibly go wrong?

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EXTREME
NORTHWESTERN LAKE...COOK...DUPAGE...NORTHWESTERN WILL...NORTHEASTERN
KENDALL AND SOUTHEASTERN KANE COUNTIES UNTIL 130 PM CDT...

AT 1229 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND EXTREME DAMAGING WINDS IN EXCESS OF 100 MPH. THESE STORMS
WERE LOCATED ALONG A LINE EXTENDING FROM DES PLAINES TO MAYWOOD TO
WESTERN SPRINGS TO WOODRIDGE...MOVING EAST AT 45 MPH.
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Hurricane force wind gusts being reported in west Chicago.

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Quoting TropicalAnalystwx13:
Just your average 100 mph winds headed towards Chicago.

.............gee the name Windy City..sure applies huh
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Just your average 100 mph winds headed towards Chicago.

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Quoting MZT:
I'll admit, I hope it doesn't get quite as hot as yesterday. I'm trying to save some $ this summer, have left my A/C off. Yesterday, the walls and furniture felt warm. Turn on the tap, and the first slug of water felt warm.

It would be hard to imagine living in an environment where it gets to 105 every day in the era before refrigeration. No wonder the siesta was invested first.
It is going to happen Guaranteed.

Now, keep in mind this one unassailable fact: it is only July 1. We still have most of the summer still to go...
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Quoting wpb:
is there a website that has the real time radar displays for these new sites?

Trinidad and Tobago radar
Barbados radar
Jamaican radar
Antilles radar
Belize radar
Cuban radar
Guyana radar

A couple of them are temporarily out of service.
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Quoting tazmaniad:


not cool to mow your lawn on ozone action day


if im gonna mow it anyway, why wait?
thats counterproductive to say ill save ozone today and just kill it tomorrow.
Maybe if i would buy an electric mower that would be different.
Plus i already did it, and i couldnt do it tomorrow.
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Quoting GeorgiaStormz:
temp went from 88 to 97 in 1 hr at the county airport near my house

DP 66F
RH 36%
HI 101

Currently now 99F at my house
and i have to go mow the lawn


not cool to mow your lawn on ozone action day
Member Since: May 9, 2011 Posts: 0 Comments: 33
705. wpb
Quoting nigel20:

Yeah, it's one of four radars that were constructed in the Caribbean from the European Development Fund
Link
is there a website that has the real time radar displays for these new sites?
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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.