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593 

WWUS20 KWNS 262024

SEL2

SPC WW 262024

TXZ000-270300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 432

NWS STORM PREDICTION CENTER NORMAN OK

325 PM CDT TUE JUN 26 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL AND SOUTHEAST TEXAS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 325 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 50

STATUTE MILES EITHER SIDE OF A LINE FROM 45 MILES SOUTHEAST OF

COLLEGE STATION TEXAS TO 45 MILES SOUTH SOUTHWEST OF SAN ANTONIO

TEXAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 431...



DISCUSSION...STORMS ARE DEVELOPING TO THE NORTHWEST OF HOUSTON

WITHIN AN ENVIRONMENT CHARACTERIZED BY STEEP LAPSE RATES AND A

DEEPLY MIXED BOUNDARY LAYER.  SURFACE TEMPERATURES NEAR 100 AND DEW

POINTS OF 60-65 ARE CONTRIBUTING TO AMPLE INSTABILITY /SBCAPE OF

2500-3500 J PER KG/ FOR STRONG UPDRAFTS...AND LOWER LEVEL INVERTED-V

STRUCTURE SI RESULTING IN STRONG DCAPE OF 1200-1500 J/KG.  STORMS

WILL HAVE POTENTIAL TO PRODUCE DAMAGING WIND GUSTS AND LARGE HAIL AS

THEY DEVELOP/SPREAD SWWD AT 25-30 KT.



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 550. MEAN STORM

MOTION VECTOR 05025.





...WEISS

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