

264 

WWUS20 KWNS 131719

SEL5

SPC WW 131719

GAZ000-SCZ000-CWZ000-140100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 465

NWS STORM PREDICTION CENTER NORMAN OK

120 PM EDT TUE JUL 13 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PART OF SOUTHEAST GEORGIA

       SOUTHERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 120 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 40

STATUTE MILES EITHER SIDE OF A LINE FROM 45 MILES SOUTHWEST OF

SAVANNAH GEORGIA TO 30 MILES NORTHEAST OF CHARLESTON SOUTH

CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU5).



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 464...



DISCUSSION...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE THIS

AFTERNOON WITHIN A HOT AND HUMID AIR MASS WHERE MLCAPE WILL APPROACH

3000-3500 J/KG.  VERTICAL SHEAR WILL REMAIN SOMEWHAT MARGINAL FOR

ORGANIZED...SEVERE STORMS.  HOWEVER...THE DEGREE OF INSTABILITY AND

HIGH MOISTURE CONTENT /I.E. PW VALUES AROUND 2.25 IN/ WILL SUPPORT

STRONG DOWNDRAFTS/DAMAGING WIND POTENTIAL DUE TO WATER LOADING

EFFECTS.



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 500. MEAN STORM MOTION

VECTOR 31015.





...MEAD

