

212 

WWUS20 KWNS 182223

SEL9

SPC WW 182223

GAZ000-SCZ000-CWZ000-190400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 469

NWS STORM PREDICTION CENTER NORMAN OK

625 PM EDT THU JUN 18 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND SOUTHEAST GEORGIA

       SOUTHERN SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS THURSDAY NIGHT FROM 625 PM UNTIL MIDNIGHT 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 80

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES WEST

SOUTHWEST OF MACON GEORGIA TO 25 MILES SOUTHEAST OF CHARLESTON

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

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).



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 463...WW 464...WW

465...WW 466...WW 467...WW 468...



DISCUSSION...A THUNDERSTORM CLUSTER WILL CONTINUE TO PROGRESS SEWD

ACROSS SC WITH RENEWED THUNDERSTORM DEVELOPMENT EXPECTED ALONG THE

LEADING EDGE OF THE COLD POOL.  FARTHER W...MORE SCATTERED STORMS

HAVE FORMED IN THE HOT/UNSTABLE ENVIRONMENT ACROSS CENTRAL GA.  VERY

WARM SURFACE TEMPERATURES AND DEW POINTS IN THE 70S IN ADVANCE OF

THIS CONVECTION WILL HELP MAINTAIN MODERATE-STRONG INSTABILITY

THROUGH THE EVENING AND INTO THE EARLY OVERNIGHT HOURS...WHILE

MODEST NNWLY FLOW ALOFT WILL CONTRIBUTE TO SOME ORGANIZATION OF THE

STORM CLUSTERS.  DAMAGING WINDS AND LARGE HAIL WILL BE THE PRIMARY

SEVERE THREATS.



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 34025.





...THOMPSON

