

614 

WWUS20 KWNS 060426

SEL9

SPC WW 060426

ARZ000-OKZ000-TXZ000-061200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 249

NWS STORM PREDICTION CENTER NORMAN OK

1130 PM CDT TUE MAY 5 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       WESTERN ARKANSAS

       SOUTHERN OKLAHOMA

       NORTH CENTRAL TEXAS



EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1130 PM

UNTIL 700 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 70

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTH OF

POTEAU OKLAHOMA TO 50 MILES SOUTH SOUTHWEST OF WICHITA FALLS

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 247...WW 248...



DISCUSSION...AN ISOLATED SEVERE STORM IS CURRENTLY MOVING ACROSS THE

FT WORTH AREA...AND MAY PERSIST FOR AWHILE LONGER.  OTHERWISE...NEW

STORMS ARE EXPECTED TO DEVELOP SOON ALONG SURFACE BOUNDARY FROM

SPS-FSM AS WEAK SHORTWAVE TROUGH APPROACHES.  AMPLE LOW LEVEL

MOISTURE AND MODERATE INSTABILITY...ALONG WITH FAVORABLE EFFECTIVE

SHEAR WILL PROMOTE A RISK OF SEVERE STORMS THROUGH MUCH OF THE

NIGHT.  LARGE HAIL AND DAMAGING WINDS WILL BE POSSIBLE.



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 500. MEAN STORM

MOTION VECTOR 27030.





...HART

