URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 169
NWS STORM PREDICTION CENTER NORMAN OK
235 PM EDT WED APR 20 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
ALABAMA
SOUTHWEST GEORGIA
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 235 PM UNTIL
1000 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 70
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTH OF
COLUMBUS MISSISSIPPI TO 35 MILES EAST NORTHEAST OF ALBANY
GEORGIA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9).
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 168...
DISCUSSION...TSTMS WILL CONTINUE TO INCREASE IN COVERAGE AND
INTENSITY THIS AFTERNOON ALONG OUTFLOW BOUNDARY EXTENDING ALONG A
LINE FROM MEI-MGM-E OF CSG...AND WITHIN A MODERATELY TO STRONGLY
UNSTABLE AIR MASS WITH MLCAPE VALUES OF 2000-3000 J/KG.
ADDITIONAL...ELEVATED TSTMS WILL ALSO LIKELY MOVE INTO PARTS OF NWRN
AL...ROOTED WITHIN STEEP MIDLEVEL LAPSE RATE ENVIRONMENT.
TROPOSPHERIC WIND FIELD IS FORECAST TO WEAKEN THROUGH THE AFTERNOON
WITH PROGRESSION OF UPPER TROUGH AXIS AWAY FROM THE AREA.
NONETHELESS...SUFFICIENT VERTICAL SHEAR WILL EXIST FOR MULTICELL
STORMS CAPABLE OF LARGE HAIL AND DAMAGING WINDS.
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 27030.
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