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WWUS20 KWNS 082350

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ALZ000-MSZ000-TNZ000-090800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 797

NWS STORM PREDICTION CENTER NORMAN OK

550 PM CST TUE DEC 8 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHWEST ALABAMA

       NORTHERN MISSISSIPPI

       SOUTHERN MIDDLE TENNESSEE



EFFECTIVE THIS TUESDAY AFTERNOON AND WEDNESDAY MORNING FROM 550

PM UNTIL 200 AM CST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES NORTH NORTHEAST OF

MUSCLE SHOALS ALABAMA TO 40 MILES SOUTH SOUTHEAST OF OXFORD

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND 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.



OTHER WATCH INFORMATION...CONTINUE...WW 796...



DISCUSSION...TSTMS EXPECTED TO CONTINUE MOVING/DEVELOPING RAPIDLY NE

ALONG IN TWO SEPARATE SW/NE BANDS ACROSS NRN MS THROUGH LATE EVE.

WITH BOUNDARY LAYER CONTINUING TO GRADUALLY WARM/MOISTEN INVOF THE

BANDS...AND WITH DEEP SHEAR/FORCING FOR ASCENT BOTH LIKELY TO

STRENGTHEN BETWEEN 02-06Z AS OK/AR UPR VORT APPROACHES REGION...

SETUP MAY SUPPORT EMBEDDED SUSTAINED STORMS/POSSIBLE SUPERCELLS.

THESE MAY YIELD A FEW TORNADOES AND/OR BOWING SEGMENTS WITH DMGG

WIND.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 23055.





...CORFIDI

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