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818 

WWUS20 KWNS 091830

SEL7

SPC WW 091830

KSZ000-MOZ000-100300-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 357

NWS STORM PREDICTION CENTER NORMAN OK

130 PM CDT TUE JUN 9 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       EXTREME SOUTHEAST KANSAS

       SOUTHWEST AND SOUTH CENTRAL MISSOURI



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 130 PM UNTIL

1000 PM CDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 30 MILES WEST NORTHWEST OF

JOPLIN MISSOURI TO 45 MILES NORTHEAST OF WEST PLAINS MISSOURI.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU7).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 354...WW 355...WW 356...



DISCUSSION...THE EARLIER ELEVATED CONVECTION IN ERN KS APPEARS TO BE

EVOLVING INTO A SURFACE-BASED...HP SUPERCELL TO THE NE OF CNU AS THE

WARM FRONT LIFTS NWD INTO SW MO/SE KS WITH STRONG LOW-LEVEL

DESTABILIZATION.  THE COMBINATION OF MLCAPE NEAR 3000 J/KG AND

EFFECTIVE BULK SHEAR IN EXCESS OF 50 KT WILL FAVOR PERSISTENT

SUPERCELLS CAPABLE OF PRODUCING VERY LARGE HAIL AND DAMAGING WINDS

THROUGH THE AFTERNOON/EVENING.  ADDITIONALLY...THE PRESENCE OF 68-70

F DEW POINTS AND ENHANCED LOW-LEVEL SHEAR ALONG THE WARM FRONT WILL

BE SUPPORTIVE OF TORNADOES.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 29030.





...THOMPSON

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