Dr. Jeff Masters' WunderBlog

Dangerous tornado outbreak expected Saturday; Gulf of Mexico SSTs warmest on record

Posted by: Dr. Jeff Masters, 14:57 GMT le 13 avril 2012

+47

A dangerous tornado outbreak is expected on Saturday over the Plains, says NOAA's Storm Prediction Center (SPC). Warm, moist air flowing northwards from a Gulf of Mexico that has record-warm waters will collide with cold air funneling down from Canada, creating a highly unstable air mass capable of creating strong thunderstorm updrafts. An impressive upper-level low, accompanied by a jet stream with 105 - 125 mph winds at middle levels of the atmosphere, will create plenty of wind shear, giving the air the spin it needs to form tornadoes. SPC has has issued their highest level of alert, a "High Risk," for much of Oklahoma, Kansas, and Nebraska for Saturday. Included in the "High Risk" area are the cities of Wichita, Oklahoma City, and Lincoln. This is the second time SPC has issued a "High Risk" forecast this year; the first "High Risk" forecast came for the March 2 tornado outbreak, which killed 41 people and did $1.5 - $2 billion in damage. It is very unusual for SPC to issue a "High Risk" forecast more than a day in advance of a suspected tornado outbreak; according to Wikipedia, today's "High Risk" forecast is only the second time SPC has ever done this. The other instance was for the April 6 - 8, 2006 tornado outbreak focused over Tennessee, which generated 73 tornadoes that killed 13 and did $1.5 billion in damage. People living in the threatened area need to pay close attention on Saturday to this dangerous severe weather situation.

Figure 1. Severe weather risk for Saturday, April 14, 2012, from NOAA's Storm Prediction Center.

Gulf of Mexico water temperatures the warmest on record
Temperatures in the states bordering the Gulf of Mexico were the 3rd - 7th warmest on record during the first three months of 2012, according to NOAA's National Climatic Data Center. This allowed Sea Surface Temperatures (SSTs) in the Gulf of Mexico (25 - 30°N, 85 - 90°W) to climb to 1.4°C (2.5°F) above average during March 2012, according to a wunderground analysis of the Hadley Centre SST data set. This is the warmest March value on record for the Gulf of Mexico, going back over a century of record keeping. During the first two weeks of April, Gulf of Mexico waters remained about 1.5°C above average, putting April on pace to have the warmest April water temperatures on record. Only one year in the past century has had April water temperatures in the Gulf of Mexico more than 1.1°C above average; that year was 2002 (1.4°C above average.) All that record-warm water is capable of putting record amounts of water vapor into the air, since evaporation increases when water is warmer. Because moist air is less dense than dry air, this warm, moist air flowing northwards from the Gulf of Mexico into the developing storm system over the Plains will be highly unstable once it encounters cold, dry air aloft. The record-warm waters of the Gulf of Mexico are a key reason for the high risk of severe weather over the Plains this weekend.

Figure 2. Departure of Sea Surface Temperature (SST) from average for April 12, 2012, as computed by NOAA/NESDIS. SSTs in the Gulf of Mexico are at their warmest levels on record for this time of year.

Follow Weather Underground on twitter for the latest on this potential severe weather outbreak.

Jeff Masters

April Storms (llpj04)

this storm greeted me as I came out of the grocery store, chased me home and got to my driveway the same time I did.

Lightning Up the Pond - Oklahoma (mbryan777)

Last night we had a pretty spectacular lightning storm. I put the camera on the tripod in time-lapse mode and laid on my back on the hillside above the pond taking in an amazing show. When it got more exciting than I was comfortable with, I ran for the house.

Categories: Severe Weather Tornado

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451. TropicalAnalystwx13 00:26 GMT le 14 avril 2012
Quoting RTSplayer: Ok, that's just ridiculous. It's now showing "Greater than 4 inches max hail size!" O3 74 dBZ 43,000 ft. 76 kg/m² 100% chance 100% chance >4.00 in. 21 knots WSW (257) I mean my God, that's as bad as a tornado anyway. That seems to be exaggerating...my GR2Analyst, with storm motion set, has the max. hail size at 2.61 inches. Member Since: 6 juillet 2010 Posts: 92 Comments: 25960

452. hurricanehunter27 00:32 GMT le 14 avril 2012
Quoting RTSplayer: 200mph winds is EF5 so that's not exactly what I meant. 4 and 5 inch hail stones will kill you or even demolish an automobile if it's sustained. I mean one stray stone might only bust your scalp and get you some stitches, but you would't want to be out in that at all. Fine how about 120MPH? Member Since: 22 juillet 2010 Posts: 1 Comments: 3673

453. TropicalAnalystwx13 00:33 GMT le 14 avril 2012
Oh boy. Member Since: 6 juillet 2010 Posts: 92 Comments: 25960

454. RTSplayer 00:34 GMT le 14 avril 2012
NWS just re-issued a Tornado Warning box on the cell from the Altus storm. O3 Kiowa OK 69 dBZ 40,000 ft. 75 kg/m² 100% Chance 100% Chance 3.75 in. 16 knots WSW (250) Moving to the ENE 16knots (from WSW) Member Since: 25 janvier 2012 Posts: 27 Comments: 1052

455. hurricanehunter27 00:34 GMT le 14 avril 2012
MIDSCAR is losing it and just reported a multi vortex tornado ripping roofs off home!!! Link Hover your mouse over the tornado report. Member Since: 22 juillet 2010 Posts: 1 Comments: 3673

456. 1900hurricane 00:34 GMT le 14 avril 2012
Really starting to ramp up again. Member Since: 2 août 2006 Posts: 43 Comments: 10456

457. jamesrainier 00:35 GMT le 14 avril 2012
TORNADO WARNING NATIONAL WEATHER SERVICE NORMAN OK 728 PM CDT FRI APR 13 2012 THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A * TORNADO WARNING FOR... EXTREME NORTHWESTERN COMANCHE COUNTY IN SOUTHWESTERN OKLAHOMA... EXTREME EAST CENTRAL KIOWA COUNTY IN SOUTHWESTERN OKLAHOMA... * UNTIL 800 PM CDT * AT 726 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS STORM WAS LOCATED NEAR COOPERTON...MOVING EAST AT 15 MPH. * LOCATIONS IMPACTED INCLUDE... COOPERTON. Member Since: 1 juin 2010 Posts: 0 Comments: 111

458. 1900hurricane 00:36 GMT le 14 avril 2012
Making a Wataburger run, be back in a bit. Member Since: 2 août 2006 Posts: 43 Comments: 10456

459. RTSplayer 00:36 GMT le 14 avril 2012
Quoting hurricanehunter27: Fine how about 120MPH? See, I'll stand outside in 120mph wind, as long as I have something to hold on to and there's no metal sheeting directly up wind of me. I stood outside in Katrina, even after there were a few gusts that nearly blew me off my feet... until I heard the first trees start snapping in the forest behind our house. I guess that was maybe 830 or 900 a.m. that morning when we got the worst of it. I don't mind getting pelted by some rain drops. Just don't like the idea of a pound or two of ice hitting me in the head at terminal velocity. Member Since: 25 janvier 2012 Posts: 27 Comments: 1052

460. Ameister12 00:37 GMT le 14 avril 2012
Ooh man. There could be a violent tornado near Cooperton. Member Since: 9 août 2009 Posts: 9 Comments: 3628

461. CybrTeddy 00:42 GMT le 14 avril 2012
Rotation is insane over Cooperton! Member Since: 8 juillet 2005 Posts: 255 Comments: 20633

462. RTSplayer 00:42 GMT le 14 avril 2012
Got the hook, the wind profile, the hail core all back for sure now. Strongest it's been since they dropped the previous warning box... Member Since: 25 janvier 2012 Posts: 27 Comments: 1052

463. WDEmobmet 00:44 GMT le 14 avril 2012
I dont know TA Grlevel3 was showing 3.75" Hail I just signed on, I am assuming you all are refering to the cell north of Cooperton?? Member Since: 3 février 2010 Posts: 0 Comments: 649

464. TropicalAnalystwx13 00:45 GMT le 14 avril 2012
There is a large, wedge, rain-wrapped tornado southeast of Cooperton. Member Since: 6 juillet 2010 Posts: 92 Comments: 25960

465. WDEmobmet 00:47 GMT le 14 avril 2012
OKay I see know that we are in fact talking about the same cell Member Since: 3 février 2010 Posts: 0 Comments: 649

466. RTSplayer 00:49 GMT le 14 avril 2012
Quoting WDEmobmet: I dont know TA Grlevel3 was showing 3.75" Hail I think the wunderground product is estimating the maximum potential hail size, but I'm not sure. It could be reporting the largest detected stone in that scan...which isn't necessarily indicative of the average.... Like the other day when the little hail storm came by my house, it estimated max size of 0.75inches. the majority of what actually fell was pea to dime size. but there actually were a few quarter sized hail stones and several nickel size... So it does a good job of showing the biggest stone, or at least it did perfect for that particular storm on that day. Member Since: 25 janvier 2012 Posts: 27 Comments: 1052

467. Skyepony (Mod) 00:49 GMT le 14 avril 2012
Catching the tail of this bit working it's way south. Heads up Sebastion & Vero. It's heavier rain than it looks. Tiny cell that hit Melbourne turned right into a mesocyclone. Spotting it, it's between the NWS & Me. Sky is red. No lightning. Member Since: 10 août 2005 Posts: 145 Comments: 29960

468. WDEmobmet 00:50 GMT le 14 avril 2012
Quoting RTSplayer: I think the wunderground product is estimating the maximum potential hail size, but I'm not sure. It could be reporting the largest detected stone in that scan...which isn't necessarily indicative of the average.... Like the other day when the little hail storm came by my house, it estimated max size of 0.75inches. the majority of what actually fell was pea to dime size. but there actually were a few quarter sized hail stones and several nickel size... So it does a good job of showing the biggest stone, or at least it did perfect for that particular storm on that day. No doubt... Def possible since it will most likely melt on the way down. None the less it goes to show you the severity of the storm Member Since: 3 février 2010 Posts: 0 Comments: 649

469. WDEmobmet 00:56 GMT le 14 avril 2012
Can someone post the link to the chasers live feed Member Since: 3 février 2010 Posts: 0 Comments: 649

470. TropicalAnalystwx13 00:56 GMT le 14 avril 2012
Uh-oh...yellow TVS. Member Since: 6 juillet 2010 Posts: 92 Comments: 25960

471. Ameister12 00:56 GMT le 14 avril 2012
From Spotter Network Inc: 7:41PM CDT Tor<-Spotr 1 miles SSE of Cooperton, OK-Large tornado passed dirctly in front of us about 8 minutes ago....had a satellite tornado ======= This tornado could still be on the ground. Rotation is still very strong. Member Since: 9 août 2009 Posts: 9 Comments: 3628

472. WDEmobmet 00:58 GMT le 14 avril 2012
Most recent sounding from OK Member Since: 3 février 2010 Posts: 0 Comments: 649

473. RTSplayer 01:00 GMT le 14 avril 2012
Two tornado signatures in Oklahoma. O3 Kiowa OK 67 dBZ 38,000 ft. 66 kg/m� 100% Chance 100% Chance 2.50 in. 14 knots WSW (241) 0 K6 Harmon OK 68 dBZ 39,000 ft. 71 kg/m� 100% Chance 100% Chance 3.00 in. 27 knots W (264) Harmon is by Childress, which I thought looking at NWS radar. There is a hook forming in that cell much like the Altus/Kiowa county storm. Might take a few before they put an official warn box on it. NE of Childress, extreme SW Oklahoma. Second hook. Member Since: 25 janvier 2012 Posts: 27 Comments: 1052

474. 1900hurricane 01:01 GMT le 14 avril 2012
New developing hook just crossed into Oklahoma from Texas further west of the main cell. Member Since: 2 août 2006 Posts: 43 Comments: 10456

475. ncstorm 01:01 GMT le 14 avril 2012
Quoting WDEmobmet: Can someone post the link to the chasers live feed Link Member Since: 19 août 2006 Posts: 7 Comments: 8845

476. WDEmobmet 01:03 GMT le 14 avril 2012
Quoting ncstorm: Link Preciate that Member Since: 3 février 2010 Posts: 0 Comments: 649

477. TropicalAnalystwx13 01:04 GMT le 14 avril 2012
We got twins in Oklahoma. Member Since: 6 juillet 2010 Posts: 92 Comments: 25960

478. WxGeekVA 01:06 GMT le 14 avril 2012
Interesting trend on the recent GFS runs, they all seem to want to spin up another subtropical low 10-14 days out. I know this is long range, but if we get one this week then another could happen the next week too. Member Since: 3 septembre 2011 Posts: 13 Comments: 3351

479. RTSplayer 01:08 GMT le 14 avril 2012
the Harmon hook is turning east and headed directly over the same area the big one went through earlier during the first time it had a tornado warn box. Could hit almost the exact same people again. Member Since: 25 janvier 2012 Posts: 27 Comments: 1052

480. hurricanehunter27 01:09 GMT le 14 avril 2012
Wow rotation showing up on all 3 cells now. Member Since: 22 juillet 2010 Posts: 1 Comments: 3673

481. 1900hurricane 01:10 GMT le 14 avril 2012
A more zoomed out perspective: Member Since: 2 août 2006 Posts: 43 Comments: 10456

482. Ameister12 01:11 GMT le 14 avril 2012
There's two-o-them. They both have a good chance for producing a tornado. Member Since: 9 août 2009 Posts: 9 Comments: 3628

484. Ameister12 01:15 GMT le 14 avril 2012
Quoting WxGeekVA: North Korean Rocket Launch footage: That's freaking hilarious. >:D Member Since: 9 août 2009 Posts: 9 Comments: 3628

485. WDEmobmet 01:15 GMT le 14 avril 2012
likely fixing to be a third... right in the middle Member Since: 3 février 2010 Posts: 0 Comments: 649

486. AussieStorm 01:15 GMT le 14 avril 2012
Quoting WxGeekVA: North Korean Rocket Launch footage: LOL but I would link that if you can. Member Since: 30 septembre 2007 Posts: 5 Comments: 13788

487. Articuno 01:17 GMT le 14 avril 2012
Quoting WxGeekVA: North Korean Rocket Launch footage: Lmao. Member Since: 22 octobre 2011 Posts: 0 Comments: 1933

488. WDEmobmet 01:19 GMT le 14 avril 2012
I count 5 TVS Sig Member Since: 3 février 2010 Posts: 0 Comments: 649

489. WxGeekVA 01:21 GMT le 14 avril 2012
My god +12 in 5 minutes... Gotta be a record :P Member Since: 3 septembre 2011 Posts: 13 Comments: 3351

490. NCHurricane2009 01:23 GMT le 14 avril 2012
Quoting WxGeekVA: Interesting trend on the recent GFS runs, they all seem to want to spin up another subtropical low 10-14 days out. I know this is long range, but if we get one this week then another could happen the next week too. In lieu of the potential subtropical development in the next days...I posted my second "birdseye" view discussion of the 2012 Atlantic Hurricane Season. This is the 1st season in which I am doing this (and originally planned to start on June 1). I only did this in private last year's 2011 season and learned a lot from it as a result. I started this yesterday, the idea being that from two maps that show a "birds eye" view of the whole Atlantic that one could understand the dynamics of every weather system in the basin. Detailed discussion acompanies the maps to help interpret. Got positive feedback on this yesterday. If there are questions about any unclear statements in the discussion...please comment and I'll answer. Also you can leave comments on how to make things clearer or better on these discussions. THANKS.... Member Since: 15 septembre 2009 Posts: 302 Comments: 3389

491. RTSplayer 01:24 GMT le 14 avril 2012
Tornado vortex signatures. V6 Kiowa OK 69 dBZ 44,000 ft. 70 kg/m² 100% Chance 100% Chance 3.25 in. 16 knots W (259) 0 K6 Greer OK 67 dBZ 38,000 ft. 69 kg/m² 100% Chance 100% Chance 2.50 in. 23 knots W (265) Nobody along that entire corridor should sleep tonight I think. These suckers like to pop in and out over and over again. Member Since: 25 janvier 2012 Posts: 27 Comments: 1052

492. Doppler22 01:27 GMT le 14 avril 2012
There are a few storms in Oklahoma that should have a tornado warning on them Member Since: 13 février 2012 Posts: 7 Comments: 1473

493. RTSplayer 01:27 GMT le 14 avril 2012
There really is a third hook forming, slightly north of the line between the other two. Member Since: 25 janvier 2012 Posts: 27 Comments: 1052

494. WDEmobmet 01:29 GMT le 14 avril 2012
Cell southeast of Hobart forming hook echo, tornado warned soon... Funnel Junkie going in for the close up...heading right for it Member Since: 3 février 2010 Posts: 0 Comments: 649

495. Grothar 01:34 GMT le 14 avril 2012
I found a nice link to the local radar in Oklahoma. Just move the mouse over the screen and it will bring you to the worst weather. You can zoom in and also animate it Link Member Since: 17 juillet 2009 Posts: 58 Comments: 19672

496. Skyepony (Mod) 01:36 GMT le 14 avril 2012
MLB NWS has that feature coming onto the Treasure Coast in East FL as an inverted trough.. AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE MELBOURNE FL 825 PM EDT FRI APR 13 2012 .DISCUSSION... CURRENT-OVERNIGHT...MSAS SURFACE ANALYSIS PLACES AN INVERTED TROUGH OVER FLORIDA AND THE ADJACENT ATLANTIC COASTAL WATERS. LOCAL SMALL SCALE WRF MODEL FORECASTING THAT THE INVERTED TROUGH WILL FLATTEN OUT OVERNIGHT AS HIGH PRESSURE CENTERED OVER THE CAROLINAS BUILDS SOUTH AND OVER FLORIDA. THIS WILL RESULT IN EAST WINDS LATE OVERNIGHT AND INTO SATURDAY. WINDS MUCH LIGHTER THAN IN THE GRID FORECASTS BUT THE WIND SHOULD START TO INCREASE LATE OVERNIGHT AS THE INVERTED TROUGH FLATTENS OUT AND THE LEADING EDGE OF THE HIGH PRESSURE WORKS ITS WAY DOWN THE STATE AND COASTAL WATERS. Member Since: 10 août 2005 Posts: 145 Comments: 29960

497. HurricaneDean07 01:37 GMT le 14 avril 2012
Quoting WxGeekVA: Interesting trend on the recent GFS runs, they all seem to want to spin up another subtropical low 10-14 days out. I know this is long range, but if we get one this week then another could happen the next week too. Most models are trending toward that second system, but in the case of that occuring. It wouldn't be likely to be another system forming, just another piece of "Alberto" that gets caught under the High. It filters out of the pattern after the second trough comes through. Out of this coming set-up, from the way the models indicate, we get alberto then there's a piece left behind that's cuaght under the high. Then we go back into hibernation again. Member Since: 3 octobre 2010 Posts: 40 Comments: 4129

498. AussieStorm 01:38 GMT le 14 avril 2012
Are there any flash flood warnings out,,, there is some area's that have had 7" from the 1st storm and will cope a few more with the following storms. Member Since: 30 septembre 2007 Posts: 5 Comments: 13788

499. hurricanehunter27 01:39 GMT le 14 avril 2012
Why are there no tornado warnings?! Member Since: 22 juillet 2010 Posts: 1 Comments: 3673

500. Grothar 01:39 GMT le 14 avril 2012
From The Weather Channel The Weather Channel plans live continuous coverage all day Saturday, with Meteorologists Jim Cantore, Mike Seidel and Eric Fisher reporting live from areas affected by severe weather in the Plains. Member Since: 17 juillet 2009 Posts: 58 Comments: 19672

501. CybrTeddy 01:40 GMT le 14 avril 2012
Quoting WxGeekVA: Interesting trend on the recent GFS runs, they all seem to want to spin up another subtropical low 10-14 days out. I know this is long range, but if we get one this week then another could happen the next week too. Now that would be incredible. Two named storms in April. Member Since: 8 juillet 2005 Posts: 255 Comments: 20633

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