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WWUS20 KWNS 260957

SEL9

SPC WW 260957

KYZ000-TNZ000-261700-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 189...RESENT

NWS STORM PREDICTION CENTER NORMAN OK

500 AM CDT THU APR 26 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST KENTUCKY

       MIDDLE AND EASTERN TENNESSEE



EFFECTIVE THIS THURSDAY MORNING FROM 500 AM UNTIL NOON CDT.



HAIL TO 1 INCH 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 50

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 30 MILES NORTH

NORTHEAST OF KNOXVILLE TENNESSEE TO 75 MILES WEST OF CROSSVILLE

TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 188...



DISCUSSION...BOWING MCS WITH A HISTORY OF WIND DAMAGE AND LARGE HAIL

PRODUCTION IS EXPECTED TO CONTINUE SEWD ACROSS THE WATCH AREA THIS

MORNING AT 40-45 KT.  AMBIENT INFLOW AIR MASS REMAINS WARM AND

MODERATELY UNSTABLE...AND GIVEN THE STEEP MIDLEVEL LAPSE RATES AND

40-45 KT OF DEEP NWLY SHEAR...ENVIRONMENT SHOULD CONTINUE TO FOSTER

VIGOROUS UPDRAFT GROWTH ON THE LEADING EDGE OF SYSTEM COLD POOL.

DAMAGING WINDS AND HAIL WILL REMAIN THE PRIMARY HAZARDS.



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

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION

VECTOR 33040.





...MEAD

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