

187 

WWUS20 KWNS 061750

SEL7

SPC WW 061750

ALZ000-FLZ000-GAZ000-070100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 257

NWS STORM PREDICTION CENTER NORMAN OK

1250 PM CDT SUN MAY 6 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN ALABAMA

       FLORIDA PANHANDLE

       SOUTHWEST GEORGIA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 1250 PM UNTIL

800 PM CDT.



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 40

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES WEST

SOUTHWEST OF EVERGREEN ALABAMA TO 30 MILES SOUTH SOUTHEAST OF

ALBANY GEORGIA.  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...CONTINUE...WW 255...WW 256...



DISCUSSION...TSTMS ARE ORGANIZING THIS AFTERNOON IN AN ARC FROM

W-CNTRL AL TO SWRN GA WITH ACTIVITY FOCUSED ALONG A SWD-MOVING COLD

POOL.  AMBIENT AIR MASS HAS BECOME MODERATELY UNSTABLE OWING TO THE

PRESENCE OF A MOIST BOUNDARY LAYER AND SEASONABLY COOL MIDLEVEL

TEMPERATURES.  WHILE VERTICAL SHEAR WILL REMAIN WEAK...THE CHARACTER

OF THE THERMODYNAMIC ENVIRONMENT WILL FOSTER HAIL PRODUCTION AND

DAMAGING WINDS WITH THE MOST INTENSE STORMS.



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 36020.





...MEAD

