

524 

WWUS20 KWNS 180146

SEL1

SPC WW 180146

ALZ000-TNZ000-180800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 671

NWS STORM PREDICTION CENTER NORMAN OK

845 PM CDT WED OCT 17 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       NORTHWEST ALABAMA

       WEST AND WESTERN MIDDLE TENNESSEE



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 845 PM

UNTIL 300 AM CDT.



HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60

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 25 MILES WEST

NORTHWEST OF FORT CAMPBELL KENTUCKY TO 40 MILES EAST OF OXFORD

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).



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 667...WW 668...WW

669...WW 670...



DISCUSSION...SQLN CROSSING THE MS RIVER EXPECTED TO CONTINUE EWD

INTO LEE UNSTABLE LOW-LVL ENVIRONMENT OVER THE LWR TN VLY. STRENGTH

OF LARGE SCALE FORCING FOR ASCENT AND CURRENT WIND FIELD SUGGEST A

CONTINUED RISK FOR LOCALLY DMGG WIND EWD BEYOND WW 667 IN PARTS OF

WRN TN THROUGH LATE EVE.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50 KNOTS.

A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION

VECTOR 25045.





...CORFIDI

