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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 254

NWS STORM PREDICTION CENTER NORMAN OK

255 PM CDT THU MAY 30 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* TORNADO WATCH FOR PORTIONS OF

  NORTHWEST AND NORTH-CENTRAL TEXAS



* EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 255 PM UNTIL

  1000 PM CDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL TORNADOES POSSIBLE

  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO

    2.5 INCHES IN DIAMETER POSSIBLE

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EAST AND WEST OF A LINE FROM 80 MILES NORTH OF MINERAL

WELLS TEXAS TO 50 MILES WEST SOUTHWEST OF MINERAL WELLS TEXAS.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU4).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



&&



OTHER WATCH INFORMATION...CONTINUE...WW 250...WW 251...WW

252...WW 253...



DISCUSSION...ISOLATED STORM DEVELOPMENT IS ANTICIPATED ALONG THE

DRYLINE THIS AFTERNOON WITHIN A STRONGLY UNSTABLE AIR MASS WITH

MLCAPE OF AROUND 3000 J/KG.  WHEN COUPLED WITH A VERTICALLY VEERING

WIND PROFILE WITH 50 KT OF EFFECTIVE SHEAR...THE POTENTIAL WILL

EXIST FOR SUPERCELLS CAPABLE OF VERY LARGE HAIL.  THE TORNADO THREAT

IS EXPECTED TO INCREASE BY LATE AFTERNOON INTO THIS EVENING AS

LOW-LEVEL SHEAR INCREASES IN RESPONSE TO AN INTENSIFYING LLJ.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 28025.





...MEAD

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