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WWUS20 KWNS 272037

SEL8

SPC WW 272037

TNZ000-280500-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 238

NWS STORM PREDICTION CENTER NORMAN OK

335 PM CDT WED APR 27 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       MIDDLE AND EASTERN TENNESSEE



EFFECTIVE THIS WEDNESDAY AFTERNOON FROM 335 PM UNTIL MIDNIGHT CDT.



...THIS IS A PARTICULARLY DANGEROUS SITUATION...



DESTRUCTIVE TORNADOES...LARGE HAIL TO 3 INCHES IN DIAMETER...

THUNDERSTORM WIND GUSTS TO 80 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 70 MILES WEST SOUTHWEST OF

NASHVILLE TENNESSEE TO 25 MILES EAST OF KNOXVILLE TENNESSEE.  FOR

A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU8).



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 232...WW 233...WW

234...WW 235...WW 236...



DISCUSSION...A VERY UNSTABLE AIRMASS IS EXPECTED TO GRADUALLY

DEVELOP NORTHWARD INTO TN THIS EVENING IN THE WAKE OF A MORNING MCS.

WITHIN AN INCREASINGLY SHEARED ENVIRONMENT...ACCENTUATED BY

LONG/CURVING LOW LEVEL HODOGRAPHS...SUPERCELLS CAPABLE OF TORNADOES

/SOME STRONG/ WILL BE AN INCREASING/MORE WIDESPREAD CONCERN INTO

THIS EVENING.



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

SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 24040.





...GUYER/HART

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