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WWUS20 KWNS 151834

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SPC WW 151834

MDZ000-NCZ000-VAZ000-CWZ000-160200-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 580

NWS STORM PREDICTION CENTER NORMAN OK

230 PM EDT WED AUG 15 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN MARYLAND

       EASTERN NORTH CAROLINA

       SOUTHEAST VIRGINIA

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 230 PM UNTIL

1000 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 85

STATUTE MILES EITHER SIDE OF A LINE FROM 20 MILES EAST NORTHEAST

OF WALLOPS VIRGINIA TO 45 MILES SOUTH SOUTHWEST OF FAYETTEVILLE

NORTH 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.



DISCUSSION...LIFT AND CLOUDINESS ASSOCIATED WITH A WELL-DEFINED

SHORT WAVE TROUGH CROSSING INTO WRN NC HAS ALLOWED FOR THE

DEVELOPMENT OF A STRONG TEMPERATURE CONTRAST/COLD FRONT ACROSS THE

PIEDMONT THIS AFTERNOON. LOW LEVEL ASCENT ACROSS THIS ADVANCING

BOUNDARY...IN ADDITION TO LARGER SCALE SUPPORT FROM THE UPPER WAVE

AND ASSOCIATED STRONGER WIND FIELDS WILL ACT TO PROMOTE ORGANIZED

TSTMS ACROSS THE WATCH AREA THROUGH THE LATE AFTERNOON AND INTO

EVENING. A FEW SUPERCELLS AS WELL AS EVENTUAL LINE SEGMENTS APPEAR

POSSIBLE GIVEN ABUNDANT CAPE AND WEAK CINH COUPLED WITH SHEAR AOA

30KT. WHILE LARGE HAIL AND HIGH WINDS SHOULD BE THE MAIN

HAZARDS...AN ISOLATED/BRIEF TORNADO OR TWO CANNOT BE COMPLETELY

RULED OUT AS LONG AS DISCRETE STORMS EXHIBIT SUPERCELL

CHARACTERISTICS.



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 500. MEAN STORM

MOTION VECTOR 26030.





...CARBIN

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