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099 

WWUS20 KWNS 212117

SEL7

SPC WW 212117

KYZ000-TNZ000-220300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 7

NWS STORM PREDICTION CENTER NORMAN OK

320 PM CST THU JAN 21 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTH CENTRAL KENTUCKY

       MIDDLE INTO A SMALL PART OF EASTERN TENNESSEE



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 320 PM UNTIL

900 PM CST.



HAIL TO 2 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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES WEST OF

CHATTANOOGA TENNESSEE TO 20 MILES NORTH OF BOWLING GREEN

KENTUCKY.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



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...THIS SEVERE THUNDERSTORM WATCH REPLACES

TORNADO WATCH NUMBER 6. WATCH NUMBER 6 WILL NOT BE IN EFFECT

AFTER 320 PM CST.



DISCUSSION...THUNDERSTORMS WILL CONTINUE TO INCREASE ACROSS WW

THROUGH THE EVENING AHEAD OF POTENT UPPER LEVEL SYSTEM.  INSTABILITY

REMAINS WEAK...HOWEVER DEEP ASCENT AND SUFFICIENT MUCAPE WILL

SUPPORT SCATTERED STRONG TO SEVERE TSTMS WELL INTO THE EVENING.

DEEP LAYER SHEAR WILL ALSO SUSTAIN A RISK OF SUPERCELLS...WITH

PRIMARY THREATS OF LARGE HAIL AND ISOLATED DAMAGING WINDS.  GIVEN

STRENGTH OF SHEAR...A TORNADO OR TWO CAN NOT BE RULED OUT.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 350. MEAN STORM

MOTION VECTOR 24020.





...EVANS

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