

671 

WWUS20 KWNS 132153

SEL5

SPC WW 132153

KSZ000-MOZ000-140400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 295

NWS STORM PREDICTION CENTER NORMAN OK

455 PM CDT WED MAY 13 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST KANSAS

       WESTERN AND CENTRAL MISSOURI



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 455 PM UNTIL

1100 PM CDT.



HAIL TO 3 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 105

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH

NORTHWEST OF COLUMBIA MISSOURI TO 60 MILES SOUTHWEST OF CHANUTE

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 293...WW 294...



DISCUSSION...THUNDERSTORMS ARE DEVELOPING ALONG THE COLD FRONT FROM

ERN KS INTO N CENTRAL MO.  STRONG INSTABILITY IS PRESENT SE OF THE

FRONT /MLCAPE IN EXCESS OF 3000 J/KG/ AND THE CAP IS

WEAKENING...THUS STORM COVERAGE WILL INCREASE QUICKLY THIS EVENING

AS THE FRONT MOVES SEWD.  THE INITIAL STORMS COULD PRODUCE VERY

LARGE HAIL GIVEN MORE DISCRETE CELLS AND LOW-MID LEVEL VERTICAL

SHEAR THAT IS SUPPORTIVE OF SOME SUPERCELL STRUCTURES.

HOWEVER...STORMS WILL LIKELY EVOLVE INTO A MORE LINEAR MODE GIVEN

STORM INTERACTIONS...FLOW PARALLEL TO THE BOUNDARY...AND SOMEWHAT

UNIDIRECTIONAL WIND PROFILES WITH WEAKER FLOW ABOVE 500 MB.

DAMAGING WINDS AND LARGE HAIL CAN BE EXPECTED THROUGH EARLY TONIGHT

AS THE STORMS CONGEAL INTO A SEWD MOVING SQUALL LINE.



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

TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM

MOTION VECTOR 28035.





...THOMPSON

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