SVR T-STRM WATCH 157 in effect for GA/SC
Posted: Tue Apr 12, 2005 3:33 pm
Severe Thunderstorm Watch 157 just issued for much of Northern GA, and Western SC (excluding the Southern Counties of SC) ... downstream on the Eastern Side of the Watch (Eastern/Central South Carolina) monitor the situation carefully ... SPC highlighted a possibility later this evening in their discussion regarding discrete cells.
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URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 157
NWS STORM PREDICTION CENTER NORMAN OK
425 PM EDT TUE APR 12 2005
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTH GEORGIA
UPSTATE AND PIEDMONT SOUTH CAROLINA
EFFECTIVE THIS TUESDAY AFTERNOON FROM 425 PM UNTIL MIDNIGHT 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 135
STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTHWEST OF
ANDERSON SOUTH CAROLINA TO 55 MILES SOUTH SOUTHEAST OF ATHENS
GEORGIA. 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...CONTINUE...WW 156...
DISCUSSION...THUNDERSTORMS EXPECTED TO INCREASE IN
COVERAGE/INTENSITY ACROSS WW AREA DURING THE NEXT FEW HOURS AS
SURFACE HEATING AND MESOSCALE ASCENT AHEAD OF AL UPPER IMPULSE /PER
WV IMAGERY/ FURTHER DESTABILIZE REGION. RELATIVELY STEEP MID LEVEL
LAPSE RATES AND 40 KT DEEP WSWLY SHEAR SHOULD SUPPORT ORGANIZED
STORMS/SUPERCELLS WITH HAIL AND DAMAGING WIND. IF STORMS REMAIN
DISCRETE...ERN HALF OF WATCH WILL HAVE TO BE MONITORED FOR THE
POSSIBILITY THAT THE CELLS WILL INTERACT WITH SHALLOW LAYER OF
MOIST/BACKED FLOW INVOF WNW/ESE BOUNDARY N OF AHN. SUCH INTERACTION
COULD YIELD A TORNADO THREAT...AND REQUIRE UPGRADE TO A TORNADO
WATCH LATER THIS EVENING.
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 450. MEAN STORM
MOTION VECTOR 26030.