WATCHES: Severe Thunderstorm Watch Number 490

WWUS20 KWNS 221638
SEL0
SPC WW 221638
GAZ000-KYZ000-NCZ000-SCZ000-TNZ000-230000-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 490
NWS STORM PREDICTION CENTER NORMAN OK
1235 PM EDT MON JUN 22 2009

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

NORTHERN AND CENTRAL GEORGIA
EXTREME SOUTH CENTRAL AND SOUTHEAST KENTUCKY
EXTREME SOUTHWEST NORTH CAROLINA
NORTHWEST SOUTH CAROLINA
MIDDLE AND EASTERN TENNESSEE

EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 1235 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 70
STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTH OF
CROSSVILLE TENNESSEE TO 75 MILES SOUTHEAST OF ATLANTA GEORGIA.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).

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...AN EAST/WEST LINE OF THUNDERSTORMS OVER SRN KY IS
PROGRESSING SWD AT 25-30 KT...WHILE NEW STORMS ARE DEVELOPING OVER
PARTS OF TN AND GA. STORMS ARE FORMING NEAR A NNW/SSE ORIENTED WARM
FRONT WITH VERY WARM SURFACE TEMPERATURES WEST OF THE
FRONT...CONTRIBUTING TO STEEP LOW LEVEL LAPSE RATES AND MLCAPE OF
1500-2500 J/KG. NNWLY MID LEVEL FLOW ALOFT OF 30-35 KT IS
CONTRIBUTING TO SUFFICIENT DEEP LAYER SHEAR FOR ORGANIZED STORMS
WITH POTENTIAL TO PRODUCE DAMAGING WIND GUSTS AND LARGE HAIL.

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 550. MEAN STORM
MOTION VECTOR 32025.

...WEISS

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