WATCHES: Severe Thunderstorm Watch Number 659

WWUS20 KWNS 042029
SEL9
SPC WW 042029
KYZ000-TNZ000-VAZ000-050200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 659
NWS STORM PREDICTION CENTER NORMAN OK
430 PM EDT TUE AUG 4 2009

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

SOUTHEASTERN KENTUCKY
MIDDLE AND EASTERN TENNESSEE
FAR WESTERN VIRGINIA

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 430 PM UNTIL
1000 PM EDT.

HAIL TO 1.5 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 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES WEST
SOUTHWEST OF NASHVILLE TENNESSEE TO 35 MILES NORTHEAST OF BRISTOL
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 657...WW 658...

DISCUSSION...STRONG TO SEVERE THUNDERSTORMS ARE ALREADY BECOMING
WIDESPREAD ACROSS WW LATE THIS AFTERNOON AHEAD OF WEAKENING LINEAR
MCS MOVING OUT OF KY. SHEAR REMAINS MODEST...BUT AIRMASS ACROSS
MIDDLE TN INTO NERN TN IS VERY UNSTABLE. EXPECT ISOLATED DAMAGING
WINDS/HAIL WILL ACCOMPANY STRONGER STORMS AS STORMS INCREASE IN
COVERAGE THROUGH THE EARLY EVENING.

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 33035.

...EVANS

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