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April 12th/13th and 15-16th Severe Weather Thread


andyhb

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ACUS11 KWNS 140035

SWOMCD

SPC MCD 140035

OKZ000-TXZ000-140130-

MESOSCALE DISCUSSION 0514

NWS STORM PREDICTION CENTER NORMAN OK

0735 PM CDT FRI APR 13 2012

AREAS AFFECTED...SOUTHWEST/CENTRAL/NORTHEAST OK AND PART OF

NORTHWEST TX

CONCERNING...TORNADO WATCH 160...

VALID 140035Z - 140130Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 160 CONTINUES.

TORNADO WATCH 160 CONTINUES UNTIL 02Z...WITH POTENTIAL FOR TORNADOES

AND LARGE HAIL. INDICATIONS ARE THAT A REPLACEMENT TORNADO WATCH

WILL BE NEEDED IN THE NEXT HOUR OR SO FOR PORTIONS OF OK AND PERHAPS

ADJACENT PARTS OF NORTHWEST TX/EASTERN TX PANHANDLE.

MOST CONCENTRATED/SUSTAINED SEVERE POTENTIAL IS EXPECTED TO REMAIN

ESPECIALLY FOCUSED ACROSS SOUTHWEST OK/ADJACENT NORTHWEST TX OVER

THE NEXT FEW HOURS. AN ONGOING SUPERCELL IN KIOWA COUNTY OK HAD

TEMPORARILY WEAKENED FROM ITS EARLIER PROLIFIC INTENSITY AS OF

0000Z...BUT A REINTENSIFICATION HAS OCCURRED WITHIN A RELATIVELY

FAVORABLE ENVIRONMENT ACROSS SOUTHWEST OK. THE AFOREMENTIONED STORM

HAS APPEARED TO FAVOR THE IMMEDIATE COOL SIDE OF AN OUTFLOW BOUNDARY

LEFT BY EARLIER STORMS. A MORE STABLE RAIN-COOLED AIRMASS CURRENTLY

EXISTS ACROSS CENTRAL OK...ALTHOUGH THE 00Z OBSERVED SOUNDING FROM

NORMAN WAS INDICATIVE OF ONLY A VERY SHALLOW STABLE LAYER /0.5 KM/.

AS SUCH...COLD POOL ABATEMENT/OUTFLOW MODIFICATION COULD YET OCCUR

THIS EVENING INTO CENTRAL OK AS A LOW LEVEL JET INTENSIFIES.

WEST OF THE LEAD STORM ACROSS KIOWA COUNTY...ADDITIONAL SUSTAINED

SUPERCELL DEVELOPMENT CAN BE EXPECTED JUST NORTH OF THE CHILDRESS TX

AREA INTO FAR SOUTHWEST/EVENTUALLY WEST-CENTRAL OK...WITH THESE

STORMS ALSO LIKELY TO FAVOR THE PERPETUALLY-REINFORCED WEST-EAST

OUTFLOW BOUNDARY AS A MODERATELY UNSTABLE /2000-2500 J PER KG

MLCAPE/ BOUNDARY LAYER REMAINS ALONG/SOUTH OF IT. REGIONAL WIND

PROFILERS/WSR-88D DERIVED WINDS ARE INDICATIVE OF A

STRENGTHENING/BACKING TREND WITHIN THE LOWEST FEW KM DURING THE PAST

SEVERAL HOURS...WITH THE FREDERICK OK WSR-88D VWP ALREADY INDICATIVE

OF 200+ M2/S2 0-1 KM SRH. THIS SAME TREND IS EXPECTED TO CONTINUE

THIS EVENING AND HELP MAINTAIN A SUPERCELL/TORNADO THREAT

TONIGHT

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From a colleague at the NWC about the Norman tornado earlier:

"Tornado seems to have touched down near I-35 and Highway 9, then went ENE

across town with scattered damage (not a solid swath mowed down or anything

like that). Power lines down on 24th Ave SW, some roof damage and trees

down near Boyd west of Berry Road, tree damage in Rotary Park (N of Boyd at

Flood St.) scattered damage in the downtown area including at the US Post

Office and tree limbs down near Benvenuti's Restaurant. Some roof damage,

sheds blown over, etc, ENE of downtown.

Not hearing of major injuries or deaths."

Certainly nothing like May 10th obviously...

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I think we need a new thread to start up so that we separate now casting into one area and forecasting for tomorrow and Sunday into another, or has this been done and I'm just not seeing it? I don't want to start such a thread, would like some one with more experience on this site to do so, but only if they agree. If it happens thanks in advance

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I think we need a new thread to start up so that we separate now casting into one area and forecasting for tomorrow and Sunday into another, or has this been done and I'm just not seeing it? I don't want to start such a thread, would like some one with more experience on this site to do so, but only if they agree. If it happens thanks in advance

I questioned that this should have been done this morning, but I think the mods decided to leave it as is for now.

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BULLETIN - EAS ACTIVATION REQUESTED

TORNADO WARNING

NATIONAL WEATHER SERVICE NORMAN OK

802 PM CDT FRI APR 13 2012

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...

EAST CENTRAL HARMON COUNTY IN SOUTHWESTERN OKLAHOMA...

EXTREME SOUTHWESTERN GREER COUNTY IN SOUTHWESTERN OKLAHOMA...

EXTREME NORTHWESTERN JACKSON COUNTY IN SOUTHWESTERN OKLAHOMA...

* UNTIL 830 PM CDT

* AT 758 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED

A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS

DANGEROUS STORM WAS LOCATED 8 MILES NORTHWEST OF GOULD...MOVING

EAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...

GOULD AND MCQUEEN.

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