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000 

WWUS20 KWNS 202254

SEL4

SPC WW 202254

KSZ000-OKZ000-TXZ000-210500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 624

NWS STORM PREDICTION CENTER NORMAN OK

550 PM CDT MON AUG 20 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHWEST KANSAS

       THE OKLAHOMA PANHANDLE AND A SMALL PART OF NORTHWEST OKLAHOMA

       NORTHERN PARTS OF THE TEXAS PANHANDLE



EFFECTIVE THIS MONDAY AFTERNOON FROM 550 PM UNTIL MIDNIGHT 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 EAST AND WEST OF A LINE FROM 10 MILES EAST

SOUTHEAST OF BORGER TEXAS TO 50 MILES NORTH NORTHEAST OF LIBERAL

KANSAS.  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 621...WW 622...WW 623...



DISCUSSION...SUPERCELL CLUSTER IN W CNTRL KS EXPECTED TO CONTINUE

GENERALLY S OR SSE AT 20-25 KTS THROUGH MID EVENING.  COMBINATION OF

30 KT SSWLY LLJ AND 20 KT NNW MID LVL FLOW MAY FOSTER DEVELOPMENT OF

FORWARD /SWD/ STORM PROPAGATION...WITH AN ATTENDANT THREAT FOR SVR

WIND/HAIL.  SOMEWHAT WEAKER/MORE ISOLATED ACTIVITY MAY DEVELOP ALONG

LEE TROUGH/DRY LINE IN THE OK/TX PANHANDLE THROUGH ABOUT SUNSET.



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 34025.





...CORFIDI

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