

973 

WWUS20 KWNS 120040

SEL0

SPC WW 120040

TXZ000-120600-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 140

NWS STORM PREDICTION CENTER NORMAN OK

740 PM CDT SAT APR 11 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND NORTHWEST TEXAS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 740 PM

UNTIL 100 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 75 MILES NORTH

NORTHWEST OF ABILENE TEXAS TO 45 MILES EAST SOUTHEAST OF SAN

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 139...



DISCUSSION...A BROKEN BAND OF THUNDERSTORMS...INCLUDING SUPERCELLS

WITH SIGNIFICANT HAIL IN THE MIDLAND AREA...WILL CONTINUE TO SPREAD

EWD TOWARD THE ABI-SJT CORRIDOR THROUGH THE EARLY OVERNIGHT HOURS IN

ADVANCE OF A MID LEVEL TROUGH OVER NM/FAR W TX.  INSTABILITY WILL

LIKELY BE WEAKER COMPARED TO AREAS FARTHER W THIS EVENING...BUT

INCREASING LOW-LEVEL WAA/MOISTENING WILL MAINTAIN SUFFICIENT MID

LEVEL INSTABILITY TO SUPPORT LARGE HAIL WITH THE MORE INTENSE

STORMS.



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 27030.





...THOMPSON

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