

000 

WWUS20 KWNS 271936

SEL0

SPC WW 271936

OKZ000-TXZ000-280300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 380

NWS STORM PREDICTION CENTER NORMAN OK

235 PM CDT TUE MAY 27 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF SOUTHWESTERN OKLAHOMA

       LARGE PART OF NORTHWEST TEXAS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 235 PM UNTIL

1000 PM CDT.



HAIL TO 3 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 75

STATUTE MILES EITHER SIDE OF A LINE FROM 35 MILES NORTH OF

CHILDRESS TEXAS TO 15 MILES EAST SOUTHEAST OF TEMPLE TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 378...WW 379...



DISCUSSION...OUTFLOW AND FRONTAL BOUNDARIES WILL BE FOCUS FOR SEVERE

THUNDERSTORM DEVELOPMENT IN A VERY UNSTABLE BUT ONLY WEAKLY SHEARED

AIR MASS.  GIVEN MLCAPES TO 3000 J/KG AND STEEP MID LEVEL LAPSE

RATES...ROTATING STORMS ARE LIKELY.  HOWEVER PRIMARY THREAT WILL BE

VERY LARGE HAIL AND DAMAGING DOWNBURSTS AS THE STORM BASES SHOULD BE

RELATIVELY HIGH SHEAR AROUND 20KT.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 27015.





...HALES

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