

872 

WWUS20 KWNS 171656

SEL9

SPC WW 171656

KYZ000-NCZ000-TNZ000-VAZ000-180000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 439

NWS STORM PREDICTION CENTER NORMAN OK

1255 PM EDT WED JUN 17 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PARTS OF EASTERN AND SOUTHERN KENTUCKY

       WESTERN NORTH CAROLINA

       PARTS OF MIDDLE AND EASTERN TENNESSEE

       PARTS OF WESTERN VIRGINIA



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1255 PM UNTIL

800 PM EDT.



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 110

STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES NORTH OF

LONDON KENTUCKY TO 55 MILES SOUTH SOUTHEAST OF KNOXVILLE

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.



DISCUSSION...AIR MASS HAS BECOME MDTLY UNSTABLE WITH LITTLE

REMAINING CINH ACROSS THE WATCH AREA.  THUNDERSTORMS EXPECTED TO

INCREASE IN NUMBER AND INTENSITY THRU THE AFTERNOON.  WITH MLCAPES

AOA 2000 J/KG AND EFFECTIVE SHEAR OF 30-40KT...SEVERE THUNDERSTORMS

SHOULD DEVELOP.  AS STORMS EVOLVE INTO CLUSTERS/SHORT

LINES...DAMAGING WINDS WILL BECOME INCREASING THREAT.



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 500. MEAN STORM

MOTION VECTOR 30030.





...HALES

