

384 

WWUS20 KWNS 121251

SEL8

SPC WW 121251

TXZ000-CWZ000-122000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 288

NWS STORM PREDICTION CENTER NORMAN OK

750 AM CDT THU MAY 12 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH TEXAS

       COASTAL WATERS



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 750 AM UNTIL

300 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 65

STATUTE MILES EITHER SIDE OF A LINE FROM 50 MILES WEST OF HONDO

TEXAS TO 20 MILES SOUTHEAST OF CORPUS CHRISTI TEXAS.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 287. WATCH NUMBER 287 WILL NOT

BE IN EFFECT AFTER 750 AM CDT.



DISCUSSION...BOWING MCS WITH EMBEDDED SUPERCELLS HAS ACCELERATED TO

40 KT AND WILL CONTINUE SEWD TO THE TX COAST NEAR CRP LATER THIS

MORNING.  INFLOW AIR MASS IS CHARACTERIZED BY A VERY MOIST BOUNDARY

LAYER AND STEEP MIDLEVEL LAPSE RATES WITH MUCAPE IN EXCESS OF 3000

J/KG.  AS SUCH...EXPECT MCS TO REMAIN CAPABLE OF DAMAGING WINDS AND

HAIL ALONG ITS TRACK.



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 600. MEAN STORM

MOTION VECTOR 33035.





...MEAD

