

418 

WWUS20 KWNS 092149

SEL6

SPC WW 092149

ALZ000-FLZ000-GAZ000-MSZ000-CWZ000-100400-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 756

NWS STORM PREDICTION CENTER NORMAN OK

445 PM CDT TUE AUG 9 2011



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN ALABAMA

       WESTERN HALF OF THE FLORIDA PANHANDLE

       SOUTHWEST GEORGIA

       SOUTHEAST MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 445 PM UNTIL

1100 PM CDT.



HAIL TO 0.5 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 NORTH AND SOUTH OF A LINE FROM 55 MILES NORTHWEST

OF MOBILE ALABAMA TO 25 MILES SOUTH SOUTHEAST OF ALBANY GEORGIA.

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 753...WW 754...WW 755...



DISCUSSION...EXTENSIVE BUT LOOSELY ORGANIZED BAND OF TSTMS FROM SE

MS INTO SW GA EXPECTED TO CONTINUE MAINLY SSE THROUGH MID/LATE EVE.

AREA AHEAD OF BAND IN MS AND MOST OF AL HAS NOT EXPERIENCED DEEP

OVERTURNING IN THE PAST 36 HRS.  GIVEN STRONG SFC HEATING AND WLY

LOW LVL FLOW OVER THAT REGION TODAY...THIS CORRIDOR LIKELY HAS STEEP

LOW LVL LAPSE RATES.  COUPLED WITH 20+ KT UNIDIRECTIONAL 700-50 MB

FLOW...PW AOA 2 INCHES...AND EMBEDDED LOW AMPLITUDE LEWPS...SETUP

MAY YIELD SPORADIC WET MICROBURSTS AND/OR A FEW SWATHS OF MARGINALLY

SVR WINDS.



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

TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM

MOTION VECTOR 32025.





...CORFIDI

