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000 

WWUS20 KWNS 092049

SEL6

SPC WW 092049

KSZ000-OKZ000-100200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 816

NWS STORM PREDICTION CENTER NORMAN OK

345 PM CDT SAT AUG 9 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL KANSAS

       NORTH CENTRAL OKLAHOMA



EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 345 PM UNTIL

900 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST OF

MEDICINE LODGE KANSAS TO 30 MILES SOUTHEAST OF PONCA CITY

OKLAHOMA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 815...



DISCUSSION...SMALL WINDOW OF FAVORABLE CONDITIONS DEVELOPING LATE

THIS AFTERNOON ALONG SURFACE OUTFLOW BOUNDARY/WARM FRONT CURRENTLY

ANCHORED FROM LOW CENTER OVER SWRN KS INTO NERN OK.  SOUTH OF THIS

BOUNDARY TEMPERATURES ARE QUITE WARM WHICH ARE BOOSTING INSTABILITY

INVOF THE FRONT...ESPECIALLY WHERE DEW POINTS ARE HOLDING IN THE 70S

F.  IN ADDITION...LOW LEVEL KINEMATIC RESPONSE AHEAD OF SLOW MOVING

LOW/MID LEVEL LOW OVER KS IS SUPPORTING IMPRESSIVE HODOGRAPHS IN THE

LOWEST 2-3 KM EVIDENT ON AREA VWP/PROFILERS.  EXPECT DEVELOPMENT

WILL CONTINUE INCREASING IN COVERAGE/INTENSITY NEAR THE OK/KS BORDER

LATE TODAY AS CAP WEAKENS AND DEVELOP SEWD THROUGH THE EVENING.

POTENTIAL FOR A BRIEF TORNADO CAN NOT BE DISCOUNTED WITH ANY

PERSISTENT SUPERCELL NEAR THE FRONT...HOWEVER LARGE HAIL AND

DAMAGING WINDS ARE EXPECTED TO BE MAIN THREATS.  ACTIVITY WILL

LIKELY EVOLVE INTO A LARGER MCS THIS EVENING.



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 550. MEAN STORM

MOTION VECTOR 29025.





...EVANS

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