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URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 115

NWS STORM PREDICTION CENTER NORMAN OK

615 PM EDT SAT APR 9 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       WESTERN AND SOUTHERN NORTH CAROLINA

       UPSTATE AND PIEDMONT SOUTH CAROLINA



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 615 PM

UNTIL 200 AM EDT.



TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES EITHER SIDE OF A LINE FROM 35 MILES NORTH OF ASHEVILLE

NORTH CAROLINA TO 25 MILES EAST SOUTHEAST OF ORANGEBURG SOUTH

CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 113...WW 114...



DISCUSSION...TSTMS/SUPERCELLS EXPECTED TO PERSIST ALONG DEEP FRONTAL

ZONE ORIENTED WNW/ESE FROM WRN NC INTO N CNTRL SC.  INSTABILITY WILL

BE IMPORTED BY STRENGTHENING WSWLY 850-700 MB FLOW ASSOCIATED WITH

UPR VORT/MCS PASSING BY TO THE N.  LENGTHENING HODOGRAPHS AND

ASSOCIATED STEEP LAPSE RATE PLUME COULD SUPPORT IN INCREASING

POTENTIAL FOR LOW-LVL MESOCYCLONES/TORNADOES GIVEN FAIRLY MOIST

LOW-LVL ENVIRONMENT INVOF WEAK BACK-DOOR FRONT AT THE SFC...WITH THE

THREAT CONTINUING INTO TONIGHT DESPITE LOSS OF DAYTIME HEATING.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

550. MEAN STORM MOTION VECTOR 29030.





...CORFIDI

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