WWUS20 KWNS 012005
SEL7
SPC WW 012005
ALZ000-MSZ000-TNZ000-020300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 547
NWS STORM PREDICTION CENTER NORMAN OK
305 PM CDT WED AUG 1 2012

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

       NORTHWEST ALABAMA
       NORTHERN AND CENTRAL MISSISSIPPI
       SOUTHWEST TENNESSEE

EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 305 PM UNTIL
1000 PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 75
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES NORTHWEST OF
MUSCLE SHOALS ALABAMA TO 65 MILES SOUTH SOUTHEAST OF JACKSON
MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).

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 544...WW 546...

DISCUSSION...SMALL SCALE IMPULSE DEVELOPING SEWD ACROSS THE MS
VALLEY WILL AID ASCENT ACROSS A VERY UNSTABLE AIRMASS ACROSS PARTS
OF MS AND THE TN VALLEY THROUGH THE LATE AFTERNOON. WHILE DEEP-LAYER
FLOW IS NOT PARTICULARLY STRONG WITH THIS IMPULSE...MAGNITUDE OF
INSTABILITY /MLCAPE AROUND 3000-4000 J PER KG/ WILL LIKELY
COMPENSATE FOR LIMITED SHEAR SO THAT MULTICELLUAR STORMS CAN
ORGANIZE SUFFICIENTLY FOR A DAMAGING WIND AND HAIL THREAT ACROSS THE
WATCH AREA INTO THE EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 65
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. MEAN STORM
MOTION VECTOR 33020.


...CARBIN