

102 

WWUS20 KWNS 210605

SEL1

SPC WW 210605

OKZ000-TXZ000-211100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 611

NWS STORM PREDICTION CENTER NORMAN OK

105 AM CDT TUE JUL 21 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST OKLAHOMA

       WESTERN NORTH TEXAS



EFFECTIVE THIS TUESDAY MORNING FROM 105 AM UNTIL 600 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 45

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

ALTUS OKLAHOMA TO 60 MILES SOUTHEAST OF CHICKASHA OKLAHOMA.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 607...WW 609...WW 610...



DISCUSSION...A BAND OF INTENSE THUNDERSTORMS OVER WESTERN OK WILL

CONTINUE TO SAG SOUTHWARD TONIGHT...EVENTUALLY INTO NORTHWEST TX.

STEEP LOW LEVEL LAPSE RATES ABOVE THE NOCTURNAL INVERSION AND AMPLE

INSTABILITY WILL MAINTAIN A RISK OF LOCALLY DAMAGING WINDS AND HAIL

FOR ANOTHER SEVERAL HOURS.



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 34030.





...HART

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