

000 

WWUS20 KWNS 161834

SEL7

SPC WW 161834

TXZ000-170100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 57

NWS STORM PREDICTION CENTER NORMAN OK

1235 PM CST SAT FEB 16 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL TEXAS



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 1235 PM UNTIL

700 PM CST.



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 75

STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES WEST OF NEW

BRAUNFELS TEXAS TO 20 MILES WEST NORTHWEST OF SHERMAN TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



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.



DISCUSSION...INCREASE IN THUNDERSTORM COVERAGE AND INTENSITY WILL

CONTINUE ENEWD ACROSS WW THIS AFTERNOON AHEAD OF VERY STRONG UPPER

SYSTEM NOW MOVING ACROSS SWRN TX.  DESPITE COOL AND STABLE SURFACE

CONDITIONS...STEEP MID LEVEL LAPSE RATES AND STRONG ASCENT WILL

MAINTAIN A FEW STRONGER STORMS.  IN ADDITION...SUFFICIENT EFFECTIVE

BULK SHEAR FOR SUPERCELLS WILL ENHANCE THE POTENTIAL FOR LARGE HAIL

WITH THE MORE INTENSE CORES.



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 450. MEAN STORM

MOTION VECTOR 22035.





...EVANS

