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821 

WWUS20 KWNS 112054

SEL4

SPC WW 112054

TXZ000-120400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 374

NWS STORM PREDICTION CENTER NORMAN OK

355 PM CDT MON JUN 11 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WEST-CENTRAL AND NORTH-CENTRAL TEXAS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 355 PM UNTIL

1100 PM CDT.



HAIL TO 2.5 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST OF SAN

ANGELO TEXAS TO 40 MILES NORTH NORTHEAST OF DALLAS TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



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 372...WW 373...



DISCUSSION...TSTMS ARE RAPIDLY DEVELOPING BETWEEN BPG AND SJT WITHIN

A HOT...DEEPLY-MIXED BOUNDARY LAYER JUST AHEAD OF COLD FRONT WHERE

CAP HAS BEEN ERODED.  SUBSEQUENT STORM FORMATION IS ANTICIPATED LATE

THIS AFTERNOON INTO EARLY EVENING NEWD ALONG LOW-LEVEL THERMAL AXIS

INTO N-CNTRL TX WHERE ENVIRONMENT IS MODERATE TO EXTREMELY UNSTABLE

WITH MLCAPE OF 2000-4000+ J/KG.  WHILE VERTICAL SHEAR WILL REMAIN

RELATIVELY WEAK...THE DEGREE OF INSTABILITY WILL PROMOTE VIGOROUS

UP/DOWNDRAFTS WITH AN ASSOCIATED RISK FOR DAMAGING WINDS AND VERY

LARGE HAIL.



AVIATION...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 500. MEAN STORM

MOTION VECTOR 31010.





...MEAD

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