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000 

WWUS20 KWNS 131859

SEL4

SPC WW 131859

OKZ000-140100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 134

NWS STORM PREDICTION CENTER NORMAN OK

200 PM CDT FRI APR 13 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHERN OKLAHOMA



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 200 PM UNTIL 800

PM 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 75

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 20 MILES SOUTH OF

CLINTON OKLAHOMA TO 10 MILES SOUTHEAST OF POTEAU OKLAHOMA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU4).



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 133...



DISCUSSION...SCATTERED STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED

TO INCREASE THROUGH THE AFTERNOON ACROSS SOUTHERN OK...AHEAD OF

APPROACHING UPPER TROUGH.  ELEVATED SUPERCELLS ARE POSSIBLE OVER

THIS REGION...ABOVE STABLE BOUNDARY LAYER.  LARGE HAIL APPEARS TO BE

THE MAIN THREAT.



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 24030.





...HART

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