

114 

WWUS20 KWNS 110321

SEL8

SPC WW 110321

GAZ000-NCZ000-SCZ000-CWZ000-111000-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 138

NWS STORM PREDICTION CENTER NORMAN OK

1120 PM EDT FRI APR 10 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST GEORGIA

       EASTERN NORTH CAROLINA

       EASTERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1120 PM

UNTIL 600 AM 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH OF NEW

BERN NORTH CAROLINA TO 20 MILES SOUTH SOUTHWEST OF SAVANNAH

GEORGIA.  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.



OTHER WATCH INFORMATION...CONTINUE...WW 135...WW 136...WW 137...



DISCUSSION...CONVECTION IS EXPECTED TO CONTINUE OVERNIGHT AND SPREAD

EWD TOWARD THE SC/NC COASTAL PLAINS IN ADVANCE OF THE MID LEVEL

TROUGH MOVING EWD FROM THE SRN APPALACHIANS.  INSTABILITY IS

MARGINAL NEAR THE COAST...BUT COOLING MID LEVEL TEMPERATURES AND

SOMEWHAT STEEPER LAPSE RATES WILL SPREAD EWD AND CONTRIBUTE TO

SUFFICIENT DESTABILIZATION TO MAINTAIN THE THUNDERSTORMS FOR SEVERAL

MORE HOURS.  STRENGTHENING LOW-LEVEL WINDS WILL SUPPORT DAMAGING

WINDS AS THE PRIMARY SEVERE THREAT OVERNIGHT...THOUGH MARGINALLY

SEVERE HAIL AND A BRIEF TORNADO CANNOT BE RULED OUT.



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 450. MEAN STORM MOTION

VECTOR 27040.





...THOMPSON

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