

110 

WWUS20 KWNS 030053

SEL9

SPC WW 030053

TXZ000-CWZ000-030800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 249

NWS STORM PREDICTION CENTER NORMAN OK

755 PM CDT WED JUN 2 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL AND SOUTH TEXAS

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 755 PM

UNTIL 300 AM 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 100

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH

NORTHWEST OF SAN ANTONIO TEXAS TO 70 MILES SOUTH SOUTHWEST OF

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 247...WW 248...



DISCUSSION...SEVERAL LARGE THUNDERSTORM CLUSTERS WILL LIKELY PERSIST

OVERNIGHT WITH THE POTENTIAL FOR CLUSTER MERGERS ACROSS S CENTRAL TX

LATER THIS EVENING.  SOME INCREASE IN STORM INTENSITY IS ALSO

EXPECTED BETWEEN VCT AND AUS AS SEPARATE OUTFLOW BOUNDARIES COLLIDE.

 A LARGE RESERVOIR OF 3000-4000 J/KG MLCAPE WILL HELP MAINTAIN THE

CONVECTION AND THE CONTINUING RISK FOR DAMAGING WINDS AND LARGE

HAIL.



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 600. MEAN STORM

MOTION VECTOR 32020.





...THOMPSON

