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WWUS20 KWNS 211931

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 206

NWS STORM PREDICTION CENTER NORMAN OK

330 PM EDT TUE MAY 21 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A



* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

  EASTERN KENTUCKY

  SOUTHERN OHIO

  EASTERN TENNESSEE

  SOUTHWEST VIRGINIA

  SOUTHWESTERN WEST VIRGINIA



* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 330 PM UNTIL

  1000 PM EDT.



* PRIMARY THREATS INCLUDE...

  SEVERAL DAMAGING WIND GUSTS TO 70 MPH LIKELY

  A FEW LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

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

JACKSON KENTUCKY TO 55 MILES SOUTH OF KNOXVILLE TENNESSEE.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU6).



PRECAUTIONARY/PREPAREDNESS ACTIONS...



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 201...WW 202...WW

203...WW 204...WW 205...



DISCUSSION...THUNDERSTORM ACTIVITY ALONG AN EAST NORTHEASTWARD

ADVANCING SURFACE COLD POOL HAS BEEN FLUCTUATING IN INTENSITY THE

PAST FEW HOURS...BUT...IN THE PEAK AFTERNOON HEATING...SUSTAINED

INTENSIFICATION APPEARS POSSIBLE DURING THE NEXT FEW HOURS AS IT

PROGRESSES INTO THE WESTERN SLOPES OF THE CENTRAL APPALACHIANS.  THE

MOIST BOUNDARY LAYER FEEDING INTO STORMS IS RATHER UNSTABLE WITH

SIZABLE CAPE...AND MODEST...20-30 KT...SOUTHWESTERLY DEEP LAYER MEAN

FLOW...MAY CONTRIBUTE TO SYSTEM PROPAGATION ACROSS EASTERN KENTUCKY

LATE THIS AFTERNOON.  SOME ACCELERATION APPEARS POSSIBLE...ALONG

WITH PERHAPS MORE WIDESPREAD STRONG SURFACE GUSTS...SOME OF WHICH

MAY CONTINUE TO EXCEED SEVERE LIMITS.



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 26035.





...KERR

