WATCHES: Severe Thunderstorm Watch Number 550

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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