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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 428

NWS STORM PREDICTION CENTER NORMAN OK

210 PM EDT TUE JUN 29 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       EASTERN NORTH CAROLINA

       CENTRAL AND NORTHEAST SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 210 PM UNTIL

900 PM EDT.



HAIL TO 1 INCH 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 25 MILES SOUTHWEST OF

FLORENCE SOUTH CAROLINA TO 25 MILES NORTHEAST OF ELIZABETH CITY

NORTH CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).



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...A CLUSTERING OF PULSE-TYPE SEVERE STORMS IS EXPECTED

THIS AFTERNOON ALONG A PRE-FRONTAL TROUGH FROM CENTRAL SC NEWD INTO

ERN NC.  STRONG INSTABILITY AND A HOT/MOIST BOUNDARY LAYER...IN A

WEAK VERTICAL SHEAR ENVIRONMENT...WILL FAVOR HYBRID MICROBURSTS

CAPABLE OF PRODUCING DAMAGING WINDS.  THOUGH INDIVIDUAL STORMS WILL

NOT LAST PARTICULARLY LONG...SOME GROWTH INTO SMALL CLUSTERS IS

POSSIBLE THROUGH STORM/OUTFLOW MERGERS LATER THIS AFTERNOON.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM MOTION

VECTOR 27010.





...THOMPSON

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