

314 

WWUS20 KWNS 121717

SEL8

SPC WW 121717

GAZ000-NCZ000-SCZ000-CWZ000-130100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 458

NWS STORM PREDICTION CENTER NORMAN OK

115 PM EDT MON JUL 12 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       PART OF EASTERN GEORGIA

       PART OF CENTRAL AND SOUTHEAST NORTH CAROLINA

       MUCH OF SOUTH CAROLINA

       COASTAL WATERS



EFFECTIVE THIS MONDAY AFTERNOON AND EVENING FROM 115 PM UNTIL 900

PM EDT.



HAIL TO 1.5 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 60

STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES SOUTH

SOUTHWEST OF SAVANNAH GEORGIA TO 40 MILES NORTHEAST OF SOUTHERN

PINES 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...TSTMS ARE EXPECTED TO INCREASE IN COVERAGE AND

INTENSITY THIS AFTERNOON IN ADVANCE OF A SERIES OF WEAK MIDLEVEL

PERTURBATIONS PROGRESSING EWD.  AMBIENT AIR MASS IS HOT AND QUITE

HUMID WITH MLCAPE OF 1500-3000 J/KG.  THIS INSTABILITY IN

CONJUNCTION WITH A BELT OF 30-35 KT MIDLEVEL FLOW ATTENDING

ABOVE-MENTIONED IMPULSES WILL RESULT IN AN ENVIRONMENT FAVORABLE FOR

STORM ORGANIZATION INTO MULTICELL CLUSTERS OR LINE SEGMENTS CAPABLE

OF DAMAGING OUTFLOW WINDS.



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

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 27025.





...MEAD

