

325 

WWUS20 KWNS 261440

SEL9

SPC WW 261440

TXZ000-262100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 69

NWS STORM PREDICTION CENTER NORMAN OK

940 AM CDT THU MAR 26 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTH CENTRAL TEXAS



EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 940 AM UNTIL

400 PM CDT.



HAIL TO 3 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 EITHER SIDE OF A LINE FROM 15 MILES SOUTH OF DEL

RIO TEXAS TO 60 MILES SOUTHEAST OF AUSTIN 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 68...



DISCUSSION...ELEVATED STORMS HAVE DEVELOPED RAPIDLY OVER PARTS OF

SOUTH CENTRAL TEXAS WITH LEFT EXIT REGION OF STRONG SUBS TROPICAL

JET EXTENDING FROM NRN MEXICAN INTO THE NWRN GULF.  AIR MASS IS VERY

UNSTABLE WITH MUCAPE TO 3000 J/KG...AND CLOUD LAYER SHEAR IS

SUFFICIENT TO SUPPORT SUPERCELL CHARACTERISTICS.  VERY LARGE HAIL

WITH POSSIBLE WITH MOST INTENSE STORMS...AND DAMAGING WIND GUSTS

WILL ALSO BE POSSIBLE IF STORMS BECOME NEAR-SURFACE BASED DURING THE

AFTERNOON.  ACTIVITY IS EXPECTED TO SPREAD ENEWD THROUGH THE EARLY

AFTERNOON HOURS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 25030.





...WEISS

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