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

By: Dr. Jeff Masters , 2:57 PM GMT on April 13, 2012

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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.
April Storms
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.
Lightning Up the Pond - Oklahoma

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Good afternoon... What have I missed today?
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SEL1

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 161
NWS STORM PREDICTION CENTER NORMAN OK
340 PM CDT FRI APR 13 2012

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

SOUTH CENTRAL AND SOUTHEAST KANSAS
EXTREME WESTERN MISSOURI

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 340 PM UNTIL
1000 PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES SOUTHWEST OF
CHANUTE KANSAS TO 45 MILES EAST NORTHEAST OF EMPORIA KANSAS. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU1).

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.

OTHER WATCH INFORMATION...CONTINUE...WW 160...

DISCUSSION...STORMS ARE INCREASING INTO EXTREME SERN KS WITHIN A
MODERATELY UNSTABLE AIR MASS WITH MLCAPE OF 1500-2000 J/KG.
ADDITIONAL STORMS ARE EXPECTED TO DEVELOP ALONG THE WRN EDGE OF THE
LOW LEVEL MOISTURE GRADIENT AS THIS RETREATS NWWD THIS EVENING.
LOCAL VWP PROFILES EXHIBIT VEERING WITH HEIGHT AND SUFFICIENT DEEP
LAYER SHEAR TO SUPPORT ORGANIZED CONVECTION INCLUDING A FEW
SUPERCELLS. PRIMARY THREAT WILL BE LARGE HAIL AND STRONG WIND
GUSTS...ALTHOUGH AN ISOLATED TORNADO CANNOT BE RULED OUT ESPECIALLY
THIS EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 22025.


...WEISS
Member Since: August 19, 2006 Posts: 13 Comments: 15137
Quoting TropicalAnalystwx13:
AllisonHouse LLC
"I'll forego the usual "Big outbreak coming tomorrow, you need to get AllisonHouse" advertisement and just say this: We've learned SPC will have a fully staffed, fully operational backup office working in tandem at Scott Air Force Base near East St. Louis, IL in the event the Norman, OK main office has to evacuate, or gets hit by a tornado. Need I say more?"
Like-Share-3 minutes ago
Wow!
And two other things: Los Angelas getting pounded by storms.
Cells starting to fire in south central Kansas now
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Quoting MTWX:

From Wiki...
Since the time weather records have been kept, Oklahoma City has been struck by nine violent tornadoes, eight F4's and one F5.[9] On May 3, 1999 parts of southern Oklahoma City and nearby communities suffered one of the most powerful tornadoes on record, an F-5 on the Fujita Scale, with wind speeds topping 318 mph (510 km/h). This tornado was part of the 1999 Oklahoma tornado outbreak.

Link

Thank you for the info.
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Quoting TropicalAnalystwx13:
AllisonHouse LLC
"I'll forego the usual "Big outbreak coming tomorrow, you need to get AllisonHouse" advertisement and just say this: We've learned SPC will have a fully staffed, fully operational backup office working in tandem at Scott Air Force Base near East St. Louis, IL in the event the Norman, OK main office has to evacuate, or gets hit by a tornado. Need I say more?"
Like-Share-3 minutes ago


Wow. That is scary
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Probably going to be significant hail damage on I-44 corridor.

the peak intensity was really about 15 to 20 minutes ago for hail, when VIL maxed out.

It's come down quite a bit since then.

I hope nobody tried to drive though that.

It was very large area of 70 to 75 VIL at the time.
Member Since: January 25, 2012 Posts: 33 Comments: 1520
SPC says new storms will form behind the ones already there, but with a greater tornado threat.
Member Since: February 11, 2012 Posts: 0 Comments: 9725
Quoting TropicalAnalystwx13:
AllisonHouse LLC
"I'll forego the usual "Big outbreak coming tomorrow, you need to get AllisonHouse" advertisement and just say this: We've learned SPC will have a fully staffed, fully operational backup office working in tandem at Scott Air Force Base near East St. Louis, IL in the event the Norman, OK main office has to evacuate, or gets hit by a tornado. Need I say more?"
Like %uFFFD %uFFFD Share %uFFFD 11 %uFFFD 3 minutes ago %uFFFD
Damn. Its starting to sound like we have another super outbreak on our hands if the SPC is taking such measures.
Member Since: July 22, 2010 Posts: 1 Comments: 3842
AllisonHouse LLC
"I'll forego the usual "Big outbreak coming tomorrow, you need to get AllisonHouse" advertisement and just say this: We've learned SPC will have a fully staffed, fully operational backup office working in tandem at Scott Air Force Base near East St. Louis, IL in the event the Norman, OK main office has to evacuate, or gets hit by a tornado. Need I say more?"
Like-Share-3 minutes ago
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it is headed for the SPC.

returning to its maker....
Member Since: February 11, 2012 Posts: 0 Comments: 9725
The tornado threat for today will not be till well after dark correct? At least for strong tornadoes anyway.
Member Since: July 22, 2010 Posts: 1 Comments: 3842
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE WICHITA KS
327 PM CDT FRI APR 13 2012

KSZ092-132100-
SUMNER-
327 PM CDT FRI APR 13 2012

...THE NATIONAL WEATHER SERVICE IN WICHITA HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY FOR SUMNER COUNTY...

AT 322 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE TRACKING
A STRONG THUNDERSTORM NEAR BRAMAN...OR 19 MILES SOUTH OF
WELLINGTON...AND MOVING NORTHEAST AT 30 MPH.

PENNY TO NICKEL SIZE HAIL...AND WINDS TO 50 MPH ARE POSSIBLE WITH
THIS STORM.

BE PREPARED TO TAKE SHELTER IN THE EVENT THE STORMS INTENSIFY AND
BECOME SEVERE, OR A WARNING IS ISSUED BY THE NATIONAL WEATHER
SERVICE.

&&

LAT...LON 3702 9747 3732 9715 3701 9716 3699 9729
3699 9745
TIME...MOT...LOC 2027Z 226DEG 24KT 3702 9732

$$

JAKUB
Member Since: Posts: Comments:
Quoting WxGeekVA:




Probably a rain-wrapped tornado on the ground right now...
o new warnings yet for that area
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244. MTWX
Quoting Articuno:
Has there ever been a tornado that hit dead on Oklahoma City?

From Wiki...
Since the time weather records have been kept, Oklahoma City has been struck by nine violent tornadoes, eight F4's and one F5.[9] On May 3, 1999 parts of southern Oklahoma City and nearby communities suffered one of the most powerful tornadoes on record, an F-5 on the Fujita Scale, with wind speeds topping 318 mph (510 km/h). This tornado was part of the 1999 Oklahoma tornado outbreak.

Link
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Probably a rain-wrapped tornado on the ground right now...
Member Since: September 3, 2011 Posts: 13 Comments: 3470
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What TA13 and GeorgiaStormz said.
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WATCH COUNTY NOTIFICATION FOR WATCH 160
NATIONAL WEATHER SERVICE NORMAN OK
336 PM CDT FRI APR 13 2012

OKC003-009-011-015-017-027-031-033-039-043-047-05 1-053-055-057-
065-071-073-075-081-083-087-093-103-109-119-137-1 41-149-TXC155-
197-485-487-140200-
/O.CON.KOUN.TO.A.0160.000000T0000Z-120414T0200Z/

TORNADO WATCH 160 REMAINS VALID UNTIL 9 PM CDT THIS EVENING FOR
THE FOLLOWING AREAS

IN OKLAHOMA THIS WATCH INCLUDES 29 COUNTIES

IN CENTRAL OKLAHOMA

CANADIAN CLEVELAND GRADY
KINGFISHER LINCOLN LOGAN
MCCLAIN OKLAHOMA PAYNE

IN NORTHERN OKLAHOMA

GARFIELD GRANT KAY
NOBLE

IN NORTHWEST OKLAHOMA

ALFALFA BLAINE DEWEY
MAJOR

IN SOUTHERN OKLAHOMA

STEPHENS

IN SOUTHWEST OKLAHOMA

CADDO COMANCHE COTTON
GREER HARMON JACKSON
KIOWA TILLMAN

IN WESTERN OKLAHOMA

BECKHAM CUSTER WASHITA

IN TEXAS THIS WATCH INCLUDES 4 COUNTIES

IN NORTHERN TEXAS

FOARD HARDEMAN WICHITA
WILBARGER

THIS INCLUDES THE CITIES OF...ALTUS...ANADARKO...CHANDLER...
CHEROKEE...CHICKASHA...CHILLICOTHE...CLINTON...CO RDELL...
CROWELL...DUNCAN...EL RENO...ELK CITY...ENID...FAIRVIEW...
FREDERICK...GUTHRIE...HOBART...HOLLIS...KINGFISHE R...LAWTON...
MANGUM...MEDFORD...MOORE...MUSTANG...NORMAN...OKL AHOMA CITY...
PERRY...PONCA CITY...PURCELL...QUANAH...SAYRE...STILLWATER...
TALOGA...VERNON...WALTERS...WATONGA...WEATHERFORD ...
WICHITA FALLS AND YUKON.

$$
Member Since: Posts: Comments:
Quoting WxGeekVA:
Looks like a hook to me...




Radar put a tornado signature on it now.

Weird positioning I guess, but not good regardless.
Member Since: January 25, 2012 Posts: 33 Comments: 1520
Quoting Tropicsweatherpr:
FLOOD ADVISORY
NATIONAL WEATHER SERVICE SAN JUAN PR
423 PM AST FRI APR 13 2012

PRC007-025-035-041-045-129-132330-
/O.EXT.TJSJ.FA.Y.0118.000000T0000Z-120413T2330Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000 Z.OO/
CAGUAS PR-CAYEY PR-CIDRA PR-COMERIO PR-SAN LORENZO PR-AGUAS BUENAS
423 PM AST FRI APR 13 2012

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS EXTENDED THE

* URBAN AND SMALL STREAM FLOOD ADVISORY FOR MINOR FLOODING OF POOR
DRAINAGE AREAS IN
FOR THE FOLLOWING MUNICIPALITIES...

IN PUERTO RICO
CAGUAS...CAYEY...CIDRA...COMERIO...SAN LORENZO AND AGUAS BUENAS

* UNTIL 730 PM AST

* AT 422 PM AST...DOPPLER RADAR INDICATED SHOWERS AND ISOLATED
THUNDERSTORMS SOME WITH VERY HEAVY RAIN DEVELOPING AND MOVING ACROSS
OR TOWARDS THE ADVISORY AREA. AT LEAST UNTIL 7:30 PM PERIODS OF
ADDITIONAL MODERATE TO HEAVY RAINFALL...AND GUSTY WINDS WILL BE
POSSIBLE ACROSS THESE AREAS...AND FLOODING OF URBAN AREAS AND SMALL
STREAMS WILL BE LIKELY.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 1826 6616 1815 6594 1809 6599 1818 6624

$$

CASTRO




what dos this have too do with severe weather?
Member Since: Posts: Comments:
I wouldn't call the rotation strong. I mean, there is some weak, broad rotation from the low to mid levels, but nothing too strong and not quite sufficient to warrant a tornado warning...not yet. It's trying hard though.

Plus, a lot of spotters and a helicopter is on the storm.
Member Since: Posts: Comments:
No warning yet, because rotation was not good enough at ground, and lots of spotters are under the storm, first indication on TDWR of a limited area of very strong rotation to me(the blue next to the yellow.)
On regular radar, the strong rotation is elevated.
Member Since: February 11, 2012 Posts: 0 Comments: 9725
Has there ever been a tornado that hit dead on Oklahoma City?
Member Since: Posts: Comments:
FLOOD ADVISORY
NATIONAL WEATHER SERVICE SAN JUAN PR
423 PM AST FRI APR 13 2012

PRC007-025-035-041-045-129-132330-
/O.EXT.TJSJ.FA.Y.0118.000000T0000Z-120413T2330Z/
/00000.N.ER.000000T0000Z.000000T0000Z.000000T0000 Z.OO/
CAGUAS PR-CAYEY PR-CIDRA PR-COMERIO PR-SAN LORENZO PR-AGUAS BUENAS
423 PM AST FRI APR 13 2012

THE NATIONAL WEATHER SERVICE IN SAN JUAN HAS EXTENDED THE

* URBAN AND SMALL STREAM FLOOD ADVISORY FOR MINOR FLOODING OF POOR
DRAINAGE AREAS IN
FOR THE FOLLOWING MUNICIPALITIES...

IN PUERTO RICO
CAGUAS...CAYEY...CIDRA...COMERIO...SAN LORENZO AND AGUAS BUENAS

* UNTIL 730 PM AST

* AT 422 PM AST...DOPPLER RADAR INDICATED SHOWERS AND ISOLATED
THUNDERSTORMS SOME WITH VERY HEAVY RAIN DEVELOPING AND MOVING ACROSS
OR TOWARDS THE ADVISORY AREA. AT LEAST UNTIL 7:30 PM PERIODS OF
ADDITIONAL MODERATE TO HEAVY RAINFALL...AND GUSTY WINDS WILL BE
POSSIBLE ACROSS THESE AREAS...AND FLOODING OF URBAN AREAS AND SMALL
STREAMS WILL BE LIKELY.

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 1826 6616 1815 6594 1809 6599 1818 6624

$$

CASTRO
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I just looked at SPC outlook for tomorrow and now I see 2 High risk areas!?! Chasers are going to have a blast.
Member Since: July 22, 2010 Posts: 1 Comments: 3842
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Quoting WxGeekVA:
Looks like a hook to me...


Bad news, that could spawn a tornado in the Oklahoma City area. (the suburbs surrounding)
Member Since: Posts: Comments:
Quoting BigTuna:
We had baseball hail 2S of my house during last week's DFW outbreak. It does exactly the kind of damage you'd expect something that big to do :/. I haven't tried but I bet it's nearly impossible to rent a car within 200 miles of here right now.


We didn't get any hail here in the Denton area.
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Updated radar shows the fell apart. Good for them!
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Quoting DavidHOUTX:


Looks like a right turn also. That could very well be a tornado


It looks like a galaxy hahaha
Member Since: June 17, 2011 Posts: 11 Comments: 6469




Rain-Wrapped now.... Strong Couplet.. Why is there no warning?!?!
Member Since: September 3, 2011 Posts: 13 Comments: 3470
Quoting WxGeekVA:
Looks like a hook to me...



Looks like a right turn also. That could very well be a tornado
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Quoting ncstorm:
if these people get hit hard today, what are they going to do tomorrow?


My guess:get hit hard tomorrow
Member Since: June 17, 2011 Posts: 11 Comments: 6469
Really surprised a tornado warning hasn't been sent out for that cell approaching Norman, OK
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Storm seems to have turned right a little
Member Since: February 11, 2012 Posts: 0 Comments: 9725
Quoting WxGeekVA:
Looks like a hook to me...



Looks like a tiny hurricane
Member Since: June 17, 2011 Posts: 11 Comments: 6469
if these people get hit hard today, what are they going to do tomorrow?
Member Since: August 19, 2006 Posts: 13 Comments: 15137
Oh-boy! Norman/South OKC area need to watch this supercell very closely. It has really strengthened recently.
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Quoting WxGeekVA:


Using the TDWR on Wunderground... It's the yellow +s


i knew that, i just wasnt using it.
Member Since: February 11, 2012 Posts: 0 Comments: 9725
218. MTWX
Definitely a strong supercell! In this loop you can see the whole storm rotating!! Link
Member Since: Posts: Comments:
Looks like a hook to me...

Member Since: September 3, 2011 Posts: 13 Comments: 3470
Couple different hail cores in there near Grady, OK.

All of them very, very severe.


N0 Grady OK 70 dBZ 35,000 ft. 70 kg/m 100% Chance 100% Chance 3.50 in. 23 knots WSW (250)

U0 Grady OK 69 dBZ 38,000 ft. 61 kg/m 100% Chance 100% Chance 3.00 in. 23 knots WSW (250)

P0 Grady OK 67 dBZ 44,000 ft. 62 kg/m 100% Chance 100% Chance 2.75 in. 23 knots WSW (252)


This is gonna suck.

That looks to head straight for the main city.

It's even taken a jog to the right some in the past several minutes.
Member Since: January 25, 2012 Posts: 33 Comments: 1520
Quoting GeorgiaStormz:


whoa, rotation looks alot stronger than on regular radar.


Using the TDWR on Wunderground... It's the yellow +s
Member Since: September 3, 2011 Posts: 13 Comments: 3470
and they got roud 2 on sat the real deal
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Okc is Gonna get hit with more than one
Member Since: June 17, 2011 Posts: 11 Comments: 6469
Someone correct me if I'm wrong, but I believe that high amounts of Differential Reflectivity (Zdr), especially in the 4 and up range are indicative of severe hail as well.

Member Since: August 2, 2006 Posts: 46 Comments: 11666
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORMAN OK
314 PM CDT FRI APR 13 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
SOUTHEASTERN CANADIAN COUNTY IN CENTRAL OKLAHOMA...
EXTREME NORTHWESTERN CLEVELAND COUNTY IN SOUTH CENTRAL OKLAHOMA...
NORTHERN GRADY COUNTY IN SOUTH CENTRAL OKLAHOMA...
EXTREME NORTHWESTERN MCCLAIN COUNTY IN SOUTH CENTRAL OKLAHOMA...
SOUTHWESTERN OKLAHOMA COUNTY IN CENTRAL OKLAHOMA...

* UNTIL 400 PM CDT

* AT 313 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DESTRUCTIVE HAIL
UP TO BASEBALL SIZE
AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS
STORM WAS LOCATED NEAR TUTTLE...MOVING NORTHEAST AT 30 MPH.

* LOCATIONS IMPACTED INCLUDE...
MOORE...YUKON...BETHANY...MUSTANG...WARR ACRES...NEWCASTLE...
TUTTLE...MINCO...UNION CITY...
POCASSET AND BRIDGE CREEK.

THIS INCLUDES THE FOLLOWING HIGHWAYS...
INTERSTATE 35 BETWEEN MILE MARKERS 111 AND 121.
INTERSTATE 240 BETWEEN MILE MARKERS 1 AND 4.
INTERSTATE 40 BETWEEN MILE MARKERS 134 AND 148.
INTERSTATE 44 BETWEEN MILE MARKERS 96 AND 123.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOVE INSIDE A STURDY BUILDING UNTIL THE STORM HAS PASSED.
Member Since: Posts: Comments:
Quoting WxGeekVA:
The one near OKC is developing a hook... It needs a warning IMO...





whoa, rotation looks alot stronger than on regular radar.
Member Since: February 11, 2012 Posts: 0 Comments: 9725
It's up to 77 VIL now.

N0 71 dBZ 40,000 ft. 77 kg/m² 100% chance 100% chance 3.75 in. 21 knots WSW (248)
Member Since: January 25, 2012 Posts: 33 Comments: 1520
The one near OKC is developing a hook... It needs a warning IMO...



Member Since: September 3, 2011 Posts: 13 Comments: 3470
If there happens to be a debris ball, you'll be able to tell due to the large drop in Correlation Coefficient:



Hail cores may also be seen as smaller drops in CC from surrounding areas as long as they correspond to areas of high reflectivity, although this particular CC return looks very noisy...
Member Since: August 2, 2006 Posts: 46 Comments: 11666

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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.

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