

934 

WWUS20 KWNS 020649

SEL1

SPC WW 020649

TXZ000-021300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 101

NWS STORM PREDICTION CENTER NORMAN OK

150 AM CDT THU APR 2 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL INTO PART OF EASTERN TEXAS



EFFECTIVE THIS THURSDAY MORNING FROM 150 AM UNTIL 800 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 65

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTH

SOUTHEAST OF TYLER TEXAS TO 10 MILES WEST OF JUNCTION TEXAS.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...ELEVATED STRONG TO SEVERE THUNDERSTORMS WILL CONTINUE

TO DEVELOP/INCREASE FROM W-E ACROSS CENTRAL TX OVERNIGHT AHEAD OF

STRONG MID/UPPER LEVEL LOW.  AIR MASS WILL CONTINUE TO MOISTEN OVER

CENTRAL/ERN TX THROUGH THE EARLY MORNING AND ALLOW AREAS OF MODERATE

...ELEVATED INSTABILITY GIVEN VERY STEEP MID LEVEL LAPSE RATES.  IN

ADDITION...DEEP LAYER SHEAR WILL REMAIN SUPPORTIVE OF ROTATION IN

THE STRONGER CORES.  LARGE HAIL WILL BE PRIMARY SEVERE

THREAT...ALTHOUGH ISOLATED DAMAGING WINDS CAN ALSO BE EXPECTED.



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 400. MEAN STORM

MOTION VECTOR 25035.





...EVANS

