Dr. Jeff Masters' WunderBlog

Tornadoes, severe thunderstorms kill nine in OK, AR; more severe weather today
Posted by: Dr. Jeff Masters, 1:07 PM GMT on April 15, 2011 +3
Tornadoes and deadly severe thunderstorms tore through Oklahoma and Arkansas last night, killing at least nine people. The action began Thursday afternoon, when a powerful spring low pressure system intensified over western Kansas. The intensifying storm pulled in frigid Canadian air behind it and warm, moist Gulf of Mexico air in front of it, and where two air masses collided over eastern Oklahoma, a powerful cold front spawned a dangerous squall line of severe thunderstorms late Thursday afternoon. Doppler radar indicated the spinning signatures of mesocyclones inside numerous thunderstorms, and the National Weather Service began issuing multiple tornado warnings. At 6:22pm CDT, storm spotters reported a wide "stovepipe" shaped tornado had touched down in south-central Oklahoma four miles south of Milburn in Johnson County. Huge hailstones up to 4 1/2 inches in diameter--the size of softballs--began pelting the ground. The tornado roared to the northeast, ripping through the small town of Tushka, population 350, at 7:23pm. The powerful twister ripped off the roof of the local high school and destroyed dozens of buildings in Tushka, killing two people and injuring 25. The tornado moved over farmland and dissipated a short time later, but the squall line that spawned the tornado moved into Arkansas overnight, spawning severe thunderstorm winds that killed seven more people. The nine deaths made yesterday the deadliest severe weather outbreak of 2011.


Figure 1. Radar reflectivity image of the Tushka, Oklahoma tornado at 7:16pm CDT in Atoka County, seven minutes before the twister hit the town. Note the classic hook-shaped echo of the parent mesocyclone in the rotating severe thunderstorms that spawned the tornado.


Figure 2. Doppler radar velocity image of the Tushka, Oklahoma tornado at 7:16pm CDT in Atoka County, seven minutes before the twister hit the town.

The Tushka tornado brings this year's tornado death tally to five people, which is low for mid-April. In total, yesterday's severe weather outbreak had 10 tornado reports, 122 instances of large hail greater than 2" in diameter, and 91 reports of damaging winds. The action shifts eastwards to Mississippi and Alabama today, which NOAA's Storm Prediction Center have placed under its "moderate risk" region for severe weather. This is the same risk Oklahoma had during yesterday's tornado outbreak. You can follow today's outbreak using our severe weather page and interactive tornado map. This map now shows links to Youtube storm chaser videos of tornadoes, plus any wunderphotos taken of the storm. Tornado warnings have already been posted in Louisiana, Alabama, and Mississippi today. A report visible on our tornado page indicates that a tornado touched down just west of Jackson, Mississippi near noon EDT today, crossing Interstate 20 and ripping the roof off of a bank in Clinton, MS.


Figure 3. Satellite image from 23:03 UTC (5:03pm CDT) April 14, 2011, showing the strong low pressure system over the Plains that brought yesterday's severe weather outbreak. Image credit: NASA/GSFC.


Figure 4. Storm chaser video of the Tushka tornado.

Jeff Masters
Rope Tornado 1 (rrose1)
Rope Tornado 1
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Categories: Tornado
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301. aquak9 11:03 PM GMT on April 15, 2011    
Whole buncha nothing between J7 and Uniontown, AL. I'd expect there might be chasers in the area, tho.
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302. Minnemike 11:04 PM GMT on April 15, 2011    
@ #291 and #292.. interesting filament in the gulf, straight down from MS/AL stateline.
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303. KEEPEROFTHEGATE (Mod) 11:05 PM GMT on April 15, 2011    
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304. hydrus 11:06 PM GMT on April 15, 2011    
Quoting KEEPEROFTHEGATE:
Really nice radar loops Keep.....If ya have any more of thoes high rez visible loops layin around, please postem..:)
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305. emcf30 11:06 PM GMT on April 15, 2011    


Getting a good hook on this cell once again. It is amazing how long this cell has held together and spit out tornados all the way from Clinton MS. Now making a beeline for Talladega and points beyond.
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306. aquak9 11:07 PM GMT on April 15, 2011    
mmmkay, meso E9 just passed Uniontown, with J9 right on it's heels. VIL dropped, probably dropped a pile of hail would be my guess.

Too much counterflow- they're too close? might be affecting touchdown. Let's hope so.

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307. Patrap 11:08 PM GMT on April 15, 2011    

786
WFUS54 KBMX 152308
TORBMX
ALC015-027-029-121-160000-
/O.NEW.KBMX.TO.W.0073.110415T2308Z-110416T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
608 PM CDT FRI APR 15 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* TORNADO WARNING FOR...
SOUTH CENTRAL CALHOUN COUNTY IN EAST CENTRAL ALABAMA...
NORTHERN CLAY COUNTY IN EAST CENTRAL ALABAMA...
SOUTHWESTERN CLEBURNE COUNTY IN EAST CENTRAL ALABAMA...
CENTRAL TALLADEGA COUNTY IN EAST CENTRAL ALABAMA...

* UNTIL 700 PM CDT

* AT 604 PM CDT...THE NATIONAL WEATHER SERVICE WAS TRACKING A
CONFIRMED TORNADO NEAR ALPINE...OR 6 MILES NORTHEAST OF
CHILDERSBURG. DOPPLER RADAR SHOWED THIS TORNADO MOVING NORTHEAST AT
45 MPH.

* LOCATIONS IMPACTED INCLUDE...
TALLADEGA...WEST END-COBB TOWN...COBB TOWN...OXFORD...ANNISTON...
FORT MCCLELLAN...WINTERBORO...WALDO...TALLADEGA SUPERSPEEDWAY AND
TALLADEGA MUNICIPAL AIRPORT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE
LOWEST FLOOR OF A STURDY BUILDING.
Member Since: July 3, 2005 Posts: 372 Comments: 111629
308. Patrap 11:11 PM GMT on April 15, 2011    
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309. PcolaDan 11:11 PM GMT on April 15, 2011    
Cantore tweet

@JimCantore Jim Cantore
45,000 peope in tents and campers at@TalledegaSuperS for races. This is a serious situation !!
Member Since: August 22, 2008 Posts: 12 Comments: 6008
310. MrstormX 11:11 PM GMT on April 15, 2011    
Tornadic supercell heading directly at the Illinois state capitol, Springfield. It's interesting to see how different the Northern Storms are in comparison to the southern ones, not nearly as much VIL and the climate isn't quite as ripe but yet they too are tornadic.


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311. MrMixon 11:13 PM GMT on April 15, 2011    
Quoting Minnemike:
while i may not qualify as seasoned, i can tell you the one thing i religiously observe is the NOAA conus WV loop. it has not been a common occurrence in the last few years for any to be sustained for hours; more often appearing from a matured system that cycles a dry slot through and through, but almost immediately vanishes in appearance... not knowing the heights at which moisture appears in the loop, whence clouding up an eye, it's hard to say that an eye appearing signifies anything like what's seen in warm core systems. but to see hours of a sustained eye-like appearance i'm thinking signifies sustained, if not increased strengthening. i figured earlier when commenting that we just saw the maturity reached and an 'incidental' eye appeared. now i think it's a sign of the next cycling; particularly by the western Illinois line that fired.

edit: only applies to water vapor of course.. not in visible or infrared. it an eye appeared there, i'd be very impressed!


Thanks, Mike. Yeah, obviously this is a very different beast from a tropical storm/hurricane, but it sounds like it's fair to say that a sustained "eye" on the water vapor loop is a good indicator of an especially vigorous low pressure system.
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312. aquak9 11:16 PM GMT on April 15, 2011    
Right now, accoriding to latest loop, K9(the cell headed towards talladega) does not have lower level rotation. It is barely interspersed up high. BUT the winds are vicious and I hope folks are doing what they can to protect themselves.

I'm sure emergency responders are already hustling.
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313. IKE 11:16 PM GMT on April 15, 2011    

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314. KEEPEROFTHEGATE (Mod) 11:16 PM GMT on April 15, 2011    
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316. Chicklit 11:19 PM GMT on April 15, 2011    
Quoting PcolaDan:
Cantore tweet

@JimCantore Jim Cantore
45,000 peope in tents and campers at@TalledegaSuperS for races. This is a serious situation !!

what?!

* at 604 PM CDT... the National Weather Service was tracking a
confirmed tornado near alpine... or 6 miles northeast of
Childersburg. Doppler radar showed this tornado moving northeast at
45 mph.

* Locations impacted include...
Talladega... west end-Cobb Town... Cobb Town... Oxford... Anniston...
fort McClellan... Winterboro... Waldo... Talladega superspeedway and
Talladega Municipal Airport.

Precautionary/preparedness actions...

Take cover now. For your protection move to an interior room on the
lowest floor of a sturdy building.


To report severe weather...
call 1-800-856-0758.

Member Since: July 11, 2006 Posts: 14 Comments: 10255
317. StAugustineFL 11:20 PM GMT on April 15, 2011    
Heads up in the Montgomery, AL area.


606 PM CDT Fri Apr 15 2011

... A Tornado Warning remains in effect for western Montgomery and
southeastern Lowndes counties until 700 PM CDT...

At 604 PM CDT... trained weather spotters reported a tornado with
lots of damage!
This tornado was located 7 miles south of
Macedonia... or 12 miles southwest of Fort Deposit... moving northeast
at 40 mph.
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318. Patrap 11:21 PM GMT on April 15, 2011    
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319. MrstormX 11:22 PM GMT on April 15, 2011    
MIDSCAR-HARV2 have some good feed on TVN right now
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320. KEEPEROFTHEGATE (Mod) 11:22 PM GMT on April 15, 2011    
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321. KEEPEROFTHEGATE (Mod) 11:23 PM GMT on April 15, 2011    
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322. MrstormX 11:24 PM GMT on April 15, 2011    
Really interesting live video, possible funnel on live video.

Link
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323. hydrus 11:25 PM GMT on April 15, 2011    
Quoting KEEPEROFTHEGATE:
Awesome Keep...Absolutely killer loop...You can actually see the upper level winds slamming into the super-cell thunderstorms ....Thank you for posting it..:)
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324. Patrap 11:26 PM GMT on April 15, 2011    
Member Since: July 3, 2005 Posts: 372 Comments: 111629
325. IKE 11:27 PM GMT on April 15, 2011    
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE BIRMINGHAM AL
619 PM CDT FRI APR 15 2011

THE NATIONAL WEATHER SERVICE IN BIRMINGHAM HAS ISSUED A

* TORNADO WARNING FOR...
MARENGO COUNTY IN SOUTHWEST ALABAMA...

* UNTIL 715 PM CDT

* AT 617 PM CDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO AND
LARGE HAIL 6 MILES SOUTHWEST OF MT STERLING...OR 29 MILES SOUTH OF
CUBA. DOPPLER RADAR SHOWED THIS TORNADO MOVING EAST AT 50 MPH.

* LOCATIONS IMPACTED INCLUDE...
LINDEN...PUTNAM...NANAFALIA...MYRTLEWOOD...SWEET WATER...PIN
HOOK...WAYNE...DIXONS MILL...MILLER AND SHILOH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. TAKE COVER NOW. FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY
BUILDING.

&&

TO REPORT SEVERE WEATHER...
CALL 1-800-856-0758.
Member Since: June 9, 2005 Posts: 23 Comments: 37047
326. KEEPEROFTHEGATE (Mod) 11:29 PM GMT on April 15, 2011    
Quoting hydrus:
Awesome Keep...Absolutely killer loop...You can actually see the upper level winds slamming into the super-cell thunderstorms ....Thank you for posting it..:)
Member Since: July 15, 2006 Posts: 144 Comments: 40657
327. Patrap 11:31 PM GMT on April 15, 2011    
2254 WILSONVILLE SHELBY AL 3324 8648 PUBLIC REPORTS TORNADO ON HWY 25. (BMX)

Storm Reports
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328. Chicklit 11:31 PM GMT on April 15, 2011    
Correct me if I'm wrong but it looks like tonight's race was cancelled; however, there are maybe thirty thousand people camping out at Talladega. Don't think they can outrun this storm.

LinktoArticle

"School systems all over central and west Alabama released students early as a precaution. East of Birmingham, promoters postponed an ARCA race at the Talladega Superspeedway, where thousands of people were camping in open fields and getting ready for three days of races.

"It is a dilemma when you have 35,000 people camping on your site," track chairman Grant Lynch told WBRC-TV. Track officials said the race would begin at 8 a.m. Saturday, after the storm system passed."

I don't think they thought about what would happen when the bad weather comes through and all those people are camped out there.
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329. aquak9 11:34 PM GMT on April 15, 2011    
post 325- ike- that's the cell I've been watching, due west of montgomery
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330. MrstormX 11:34 PM GMT on April 15, 2011    
Quoting Chicklit:
Correct me if I'm wrong but it looks like tonight's race was cancelled; however, there are maybe thirty thousand people camping out at Talladega. Don't think they can outrun this storm.

LinktoArticle

"School systems all over central and west Alabama released students early as a precaution. East of Birmingham, promoters postponed an ARCA race at the Talladega Superspeedway, where thousands of people were camping in open fields and getting ready for three days of races.

"It is a dilemma when you have 35,000 people camping on your site," track chairman Grant Lynch told WBRC-TV. Track officials said the race would begin at 8 a.m. Saturday, after the storm system passed."

I don't think they thought about what would happen when the bad weather comes through and all those people are camped out there.


I don't fully understand how this works, do people just set up tents outside the speedway? Like in the parking lot? Or are the people at nearby campgrounds?
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331. Patrap 11:35 PM GMT on April 15, 2011    
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332. aquak9 11:36 PM GMT on April 15, 2011    
chiklit- you'd THINK since they upped it to a moderate since YESTERDAY, that someone around would have some common sense to give folks a heads-up.

I'm sure we'll see plenty of footage of this on youtube.
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333. aquak9 11:37 PM GMT on April 15, 2011    
Quoting MrstormX:


I don't fully understand how this works, do people just set up tents outside the speedway? Like in the parking lot? Or are the people at nearby campgrounds?


there's plenty of grassy areas, around the speedway, and inside the loop of the racetrack itself, they let people camp. Also tons of asphalt for parking campers.

google it, you'll see some pics.
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334. Chicklit 11:37 PM GMT on April 15, 2011    
Quoting MrstormX:


I don't fully understand how this works, do people just set up tents outside the speedway? Like in the parking lot? Or are the people at nearby campgrounds?

If it's like the Daytona Speedway, then they're inside the track as well as outside the track in flat, wide open spaces. This is worst case scenario.
Member Since: July 11, 2006 Posts: 14 Comments: 10255
335. StAugustineFL 11:39 PM GMT on April 15, 2011    
One tornado is worrisome in itself, much less 3.


... A Tornado Warning remains in effect for Perry and northwestern
Dallas counties until 715 PM CDT...

At 627 PM CDT... National Weather Service Doppler radar indicated
multiple severe thunderstorms capable of producing three separate
tornadoes
. These dangerous storms were located near valden... 5
south of Marion... and just east of Hamburg... moving northeast at 40
mph.

Locations impacted include...
Marion... valden... Paul M Grist State Park... Hamburg... Suttle... red
Ford... Sprott and Valley Creek Junction.
Member Since: March 8, 2011 Posts: 1 Comments: 574
336. Chicklit 11:39 PM GMT on April 15, 2011    
There's a cell to their southeast heading northeast with 100% hail.
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337. Patrap 11:39 PM GMT on April 15, 2011    
Talladega Superspeedway offers weather updates for fans

Updated: Apr 15, 2011 11:33 AM CST
By Melynda Sides - email

TALLADEGA, AL (WBRC) -

The Talladega Superspeedway is urging fans to keep a close eye on the weather and take whatever precautions are necessary to ensure their safety as storms are expected to move into the area Friday afternoon. The Talledgea County EMA and National Weather Service personnel are on site and will be sending out weather updates in the following ways:

NOAA Weather radio: area code 001121

Talledega EMA Facebook: Talledega EMA

Talledega EMA Twitter: @readytalladega

Free Text Updates – Text the code 35160 to 888-777

Local Radio – 92.7 FM

If the storms become severe, the American Red Cross recommends that race fans seek shelter in a vehicle, buckle up, and turn on the motor, according to a weather statement issued by the Talledega Superspeedway.

The number one thing for fans is to have a plan in case severe weather hits, Steve Dover, a spokesperson for the Talledega EMA, said.

If there are tornado warnings issued for the county and it looks like a significant number of people are leaving the Superspeedway to seek shelter, the EMA says they will follow the one-way traffic plan that is normally in effect at the end of a race.

Many fans FOX 6 spoke with said they are planning to "hunker down" and endure the bad weather, rather than leave the campground.

Copyright 2011 WBRC. All rights reserved.
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338. hydrus 11:40 PM GMT on April 15, 2011    
Quoting KEEPEROFTHEGATE:
I think I see my house .....Gotta love those high resolution sat pics...
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339. IKE 11:40 PM GMT on April 15, 2011    

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340. MrstormX 11:40 PM GMT on April 15, 2011    
Quoting aquak9:


there's plenty of grassy areas, around the speedway, and inside the loop of the racetrack itself, they let people camp. Also tons of asphalt for parking campers.

google it, you'll see some pics.
Quoting Chicklit:

If it's like the Daytona Speedway, then they're inside the track as well as outside the track in flat, wide open spaces. This is worst case scenario.


Thanks, I didn't know how they did it. Yes it definitely doesn't sound good.
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341. Chicklit 11:41 PM GMT on April 15, 2011    
"Many fans FOX 6 spoke with said they are planning to "hunker down" and endure the bad weather, rather than leave the campground."

You can pretty much figure now that will be a bad idea.
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342. louisianaboy444 11:42 PM GMT on April 15, 2011    
This may be a bit off topic but i just come up with a new theory on how we can travel long distances across the Universe. This theory has some thermodynamics and physics built in so read it and enjoy and please leave your comments!

Link
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343. MrMixon 11:42 PM GMT on April 15, 2011    
I wonder why they are urging people to turn on the motor? Is that just to give them the option to quickly move the car if debris is making a collision course?
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344. StAugustineFL 11:44 PM GMT on April 15, 2011    
A bit of good news for a change.

... The Tornado Warning for western Montgomery County is
cancelled...

The storm which prompted the warning has weakened below severe
limits... and no longer poses an immediate threat to life or property.
Member Since: March 8, 2011 Posts: 1 Comments: 574
345. Patrap 11:44 PM GMT on April 15, 2011    
Quoting MrMixon:
I wonder why they are urging people to turn on the motor? Is that just to give them the option to quickly move the car if debris is making a collision course?


it is NASCAR,..maybe its for a Pace/caution Lap?
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346. aquak9 11:44 PM GMT on April 15, 2011    
45,000 people can't exactly drive away...

ok, next ugly is this cell, gonna be trouble. Just north of Columbus GA at the state line, heading towards Woodland and then Thomaston, GA.

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347. aquak9 11:45 PM GMT on April 15, 2011    
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348. Patrap 11:46 PM GMT on April 15, 2011    
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349. Chicklit 11:47 PM GMT on April 15, 2011    
Look for the "+" in the center of this map and that is Talladega.

Link
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350. MrMixon 11:47 PM GMT on April 15, 2011    
Quoting Patrap:


it is NASCAR,..maybe its for a Pace/caution Lap?


:)
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351. emcf30 11:49 PM GMT on April 15, 2011    


This is just the North lot at the track. This is on track property and free to camp there. Talk about party central. Looks like the main cell went to the South of the track
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About JeffMasters
Jeff co-founded the Weather Underground in 1995 while working on his Ph.D. He flew with the NOAA Hurricane Hunters from 1986-1990.

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