

000 

WWUS20 KWNS 232305

SEL5

SPC WW 232305

KSZ000-OKZ000-240500-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 645

NWS STORM PREDICTION CENTER NORMAN OK

605 PM CDT THU AUG 23 2007



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHWEST KANSAS

       THE OKLAHOMA PANHANDLE



EFFECTIVE THIS THURSDAY NIGHT FROM 605 PM UNTIL MIDNIGHT CDT.



HAIL TO 1.5 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES EAST

NORTHEAST OF RUSSELL KANSAS TO 10 MILES SOUTHWEST OF ELKHART

KANSAS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED

WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 640...WW 641...WW

642...WW 643...WW 644...



DISCUSSION...THUNDERSTORMS ARE BEGINNING TO DEVELOP ALONG THE

PRIMARY SURFACE FRONT ORIENTED SW-NE ACROSS SW AND CENTRAL KS.

STEEP LOW-LEVEL LAPSE RATES AND MODERATE INSTABILITY WILL SUPPORT

STORMS CAPABLE OF PRODUCING DAMAGING DOWNBURST WINDS...AS WELL AS

LARGE HAIL.  ADDITIONAL STORMS IN NE NM/SE CO WILL LIKELY SPREAD EWD

ACROSS THE OK PANHANDLE WITH AN ATTENDANT THREAT FOR DAMAGING WINDS.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

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

MOTION VECTOR 26025.





...THOMPSON

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