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303 

WWUS20 KWNS 180015

SEL0

SPC WW 180015

MOZ000-180700-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 450

NWS STORM PREDICTION CENTER NORMAN OK

710 PM CDT WED JUN 17 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PORTIONS OF CENTRAL AND SOUTHERN MISSOURI



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 710 PM

UNTIL 200 AM 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 50 MILES NORTH OF

SPRINGFIELD MISSOURI TO 15 MILES EAST SOUTHEAST OF FARMINGTON

MISSOURI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).



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 440...WW 441...WW

442...WW 443...WW 445...WW 444...WW 446...WW 447...WW 448...WW

449...



DISCUSSION...THUNDERSTORMS CONTINUE TO INCREASE ACROSS THE NORTHERN

HALF OF MISSOURI -- WITHIN WW 443...AND ARE MOVING INCREASINGLY-SEWD

WITH TIME.  AS A SWLY LOW-LEVEL JET INCREASES THIS EVENING...EXPECT

SEWD PROPAGATION OF CONVECTION TO CONTINUE.  A VERY UNSTABLE AIRMASS

/MIXED-LAYER CAPE IN EXCESS OF 4000 J/KG/ IS IN PLACE...AND

VEERING/INCREASING FLOW WITH HEIGHT IS INDICATED ACROSS THE AREA

YIELDING SHEAR FAVORABLE FOR SUPERCELL STORMS.  THEREFORE...EXPECT A

THREAT FOR LARGE HAIL AND ISOLATED TORNADOES TO CONTINUE.

ADDITIONALLY...THE POTENTIAL FOR DAMAGING WINDS COULD INCREASE WITH

TIME...SHOULD STORMS MERGE INTO AN MCS AND DEVELOP A

WELL-ORGANIZED/SEWD-PROPAGATING COLD POOL.



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

500. MEAN STORM MOTION VECTOR 31035.





...GOSS

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