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023 

WWUS20 KWNS 100022

SEL7

SPC WW 100022

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URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 117

NWS STORM PREDICTION CENTER NORMAN OK

825 PM EDT SAT APR 9 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       COASTAL AND EASTERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 825 PM

UNTIL 200 AM 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 35

STATUTE MILES EITHER SIDE OF A LINE FROM 15 MILES NORTHEAST OF

MYRTLE BEACH SOUTH CAROLINA TO 20 MILES WEST SOUTHWEST OF

CHARLESTON 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...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 114. WATCH NUMBER 114 WILL NOT

BE IN EFFECT AFTER 825 PM EDT. CONTINUE...WW 113...WW 115...WW

116...



DISCUSSION...TSTMS...INCLUDING SOME SUSTAINED

STORMS/SUPERCELLS...EXPECTED CONTINUE MOVING ESE ALONG DEEP FRONTAL

ZONE REMAINING NEARLY STNRY ACROSS REGION.  AMPLE SHEAR/INSTABILITY

EXPECTED TO REMAIN PRESENT TO SUPPORT A COUPLE BOUTS OF WIND...HAIL

AND PERHAPS AN ISOLD TORNADO INTO LATER TONIGHT...DESPITE PRESENCE

OF SLOWLY DEEPENING COOLER MARINE AIR AT THE SFC.



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 550. MEAN STORM

MOTION VECTOR 30030.





...CORFIDI

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