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673 

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

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