

141 

WWUS20 KWNS 261738

SEL6

SPC WW 261738

GAZ000-NCZ000-SCZ000-270100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 556

NWS STORM PREDICTION CENTER NORMAN OK

140 PM EDT SUN JUN 26 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHERN GEORGIA

       WESTERN NORTH CAROLINA

       WESTERN SOUTH CAROLINA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 140 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 NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTHWEST

OF ROME GEORGIA TO 35 MILES EAST SOUTHEAST OF CHARLOTTE NORTH

CAROLINA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 555...



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

INTENSITY THIS AFTERNOON ALONG LEADING EDGE OF OUTFLOW BOUNDARY

WHICH HAS RECENTLY CRESTED THE SPINE OF THE APPALACHIANS.  AMBIENT

INFLOW AIR MASS IS EXPECTED TO BECOME QUITE HOT.  WHEN COUPLED WITH

A MOIST BOUNDARY LAYER AND STEEP MIDLEVEL LAPSE RATE

ENVIRONMENT...EXPECT AFTERNOON MLCAPE VALUES TO APPROACH 2500-3500

J/KG.  THIS INSTABILITY COMBINED WITH A BELT OF SLIGHTLY STRONGER

MIDLEVEL FLOW MOVING THROUGH THE SRN APPALACHIANS /REF. CURRENT MRX

VAD/ WILL SUPPORT THE POTENTIAL FOR ORGANIZED STORM CLUSTERS CAPABLE

OF DAMAGING WINDS AND HAIL.



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 30025.





...MEAD

