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WWUS20 KWNS 291957

SEL7

SPC WW 291957

NCZ000-SCZ000-CWZ000-300300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 817

NWS STORM PREDICTION CENTER NORMAN OK

400 PM EDT MON AUG 29 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST NORTH CAROLINA

       CENTRAL AND EASTERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 400 PM UNTIL

1100 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 85

STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES NORTHEAST OF

FLORENCE SOUTH CAROLINA TO 35 MILES SOUTH SOUTHWEST OF ORANGEBURG

SOUTH CAROLINA.  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 816...



DISCUSSION...TSTMS SHOULD CONTINUE TO INCREASE IN AREAL COVERAGE AND

INTENSITY ACROSS THE WATCH AREA THIS AFTERNOON AS REGION IS GLANCED

BY PASSAGE OF MIDLEVEL TROUGH THROUGH THE CNTRL APPALACHIANS.

THOUGH VERTICAL SHEAR TENDS TO DECREASE WITH SWD

EXTENT...INSTABILITY INCREASES TOWARD THE COAST...RESULTING IN AN

ENVIRONMENT SUPPORTIVE OF MULTICELL CLUSTERS WITH THE PRIMARY HAZARD

BEING DAMAGING WINDS.



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 27020.





...MEAD

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