

072 

WWUS20 KWNS 262219

SEL2

SPC WW 262219

OKZ000-TXZ000-270400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 312

NWS STORM PREDICTION CENTER NORMAN OK

520 PM CDT TUE MAY 26 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SMALL PART OF SOUTHERN OKLAHOMA

       MUCH OF NORTH CENTRAL TEXAS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 520 PM UNTIL

1100 PM CDT.



HAIL TO 2.5 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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 15 MILES EAST

NORTHEAST OF DURANT OKLAHOMA TO 45 MILES EAST SOUTHEAST OF

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



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...THUNDERSTORMS WILL INCREASE IN NUMBER AND INTENSITY

ALONG SURFACE BOUNDARIES IN A VERY UNSTABLE AIR MASS.  WITH MLCAPES

TO 3000 J/KG LARGE HAIL AND DAMAGING DOWNBURST WINDS WILL BE

ASSOCIATED WITH STRONGEST UPDRAFTS.  STORMS WILL MOVE SLOWLY AND

PROPAGATE  E AND SE.



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

TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 28015.





...HALES

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