

582 

WWUS20 KWNS 051808

SEL0

SPC WW 051808

ALZ000-GAZ000-060100-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 550

NWS STORM PREDICTION CENTER NORMAN OK

210 PM EDT SUN JUL 5 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       CENTRAL AND PARTS OF SOUTHERN ALABAMA

       CENTRAL GEORGIA



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 210 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 50

STATUTE MILES EITHER SIDE OF A LINE FROM 80 MILES WEST OF SELMA

ALABAMA TO 20 MILES NORTHEAST OF VIDALIA GEORGIA.  FOR A COMPLETE

DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE

(WOUS64 KWNS WOU0).



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...AREAS OF STRONG TO LOCALLY INTENSE TSTM DEVELOPMENT ARE

EXPECTED TO INCREASE ACROSS PARTS OF AL/GA THIS AFTERNOON ALONG

WEAKLY CONFLUENT OUTFLOW AND DIFFERENTIAL HEATING BOUNDARIES.

AIRMASS HAS BECOME VERY UNSTABLE WITH MLCAPE IN EXCESS OF 2000 J PER

KG AND DCAPE IN EXCESS OF 1000 J PER KG. OVERALL SHEAR PROFILES

INDICATE THAT STORMS WILL BE PULSE TO MULTICELLULAR IN CHARACTER

WITH SOME STORM-SCALE TO MESOSCALE ORGANIZATION POSSIBLE AS COLD

POOLS EXPAND AND MOVE ESEWD WITH 25-30KT MEAN-LAYER FLOW. DOWNBURST

WINDS APPEAR TO THE PRIMARY SEVERE STORM THREAT WITH THIS ACTIVITY.



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 32015.





...CARBIN

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