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WWUS20 KWNS 051737

SEL0

SPC WW 051737

GAZ000-NCZ000-SCZ000-060100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 470

NWS STORM PREDICTION CENTER NORMAN OK

135 PM EDT THU JUL 5 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EXTREME NORTHEAST GEORGIA

       WESTERN NORTH CAROLINA

       UPSTATE SOUTH CAROLINA



EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 135 PM UNTIL

900 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 80

STATUTE MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH

NORTHWEST OF HICKORY NORTH CAROLINA TO 25 MILES SOUTH SOUTHWEST

OF GREENVILLE SOUTH CAROLINA.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 469...



DISCUSSION...A CLUSTER OF THUNDERSTORMS WILL CONTINUE TO MOVE SWD

ACROSS WRN NC...WITH ADDITIONAL STORM DEVELOPMENT LIKELY OVER THE

HIGHER TERRAIN OF UPSTATE SC/WRN NC THROUGH THE AFTERNOON.

ADDITIONALLY...A LARGER CLUSTER OF STORMS ACROSS SRN WV SHOULD ALSO

SPREAD INTO WRN NC BY 20-21Z.  GIVEN THE PRESENCE OF MODERATE

INSTABILITY AND STEEP LOW-LEVEL LAPSE RATES...THESE STORMS WILL BE

CAPABLE OF PRODUCING OCCASIONAL DOWNBURSTS AND MARGINALLY SEVERE

HAIL IN THE WEAK SHEAR ENVIRONMENT.



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 550. MEAN STORM

MOTION VECTOR 36025.





...THOMPSON

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