WATCHES: Severe Thunderstorm Watch Number 73

WWUS20 KWNS 220744
SEL3
SPC WW 220744
ALZ000-MSZ000-221300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 73
NWS STORM PREDICTION CENTER NORMAN OK
145 AM CST FRI FEB 22 2008

THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

CENTRAL ALABAMA
CENTRAL MISSISSIPPI

EFFECTIVE THIS FRIDAY MORNING FROM 145 AM UNTIL 700 AM CST.

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 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 50 MILES WEST
SOUTHWEST OF JACKSON MISSISSIPPI TO 35 MILES NORTH OF AUBURN
ALABAMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 71. WATCH NUMBER 71 WILL NOT BE
IN EFFECT AFTER 145 AM CST. CONTINUE...WW 72...

DISCUSSION...A BAND OF ELEVATED THUNDERSTORMS WILL SPREAD EWD/NEWD
OVER CENTRAL MS/AL IN ADVANCE OF A MID LEVEL TROUGH EJECTING ENEWD
FROM LA. GRADUAL DESTABILIZATION ALOFT FROM MS INTO AL WILL SUPPORT
A CONTINUED THREAT FOR LARGE HAIL WITH THE STRONGEST STORMS...GIVEN
RELATIVELY STEEP MID LEVEL LAPSE RATES AND EFFECTIVE BULK SHEAR OF
40-50 KT. THE CONVECTION WILL BE ROOTED CLOSER TO THE GROUND IN MS
AND EVENTUALLY INTO WRN AL...WHERE DOWNDRAFTS WITH THE STRONGER
STORMS MAY PENETRATE THE SURFACE STABLE LAYER AND PRODUCE ISOLATED
DAMAGING GUSTS.

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 450. MEAN STORM
MOTION VECTOR 25035.

..THOMPSON

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