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WWUS20 KWNS 010637

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SPC WW 010637

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 411

NWS STORM PREDICTION CENTER NORMAN OK

235 AM EDT SUN JUN 1 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN KENTUCKY

       MIDDLE AND EASTERN TENNESSEE



EFFECTIVE THIS SUNDAY MORNING FROM 235 AM UNTIL 1000 AM EDT.



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 90

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

SOUTHEAST OF NASHVILLE TENNESSEE TO 40 MILES WEST NORTHWEST OF

LONDON KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 409...



DISCUSSION...SMALL FORWARD-PROPAGATING MCS WITH EMBEDDED

SUSTAINED/POSSIBLE ROTATING STRUCTURES WILL CONTINUE ESE INTO

LOW-LVL INSTABILITY AXIS LATER THIS MORNING.  SYSTEM APPEARS TO BE

ASSOCIATED WITH A MID-LVL IMPULSE THAT IS SHIFTING MODERATE FLOW IN

THE 700-500 MB LAYER FROM WSWLY TO WNWLY AS IT PASSES.  ALTHOUGH A

QLCS TORNADO OR TWO CANNOT BE RULED OUT...WEAK LOW-LVL SHEAR

SUGGESTS THAT PRIMARY THREAT WILL BE LOCALLY DMGG WIND.



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 29030.





...CORFIDI

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