[BNAWX] Severe Local Storm Watch and Watch Cancellation

[EMWIN Server]

WWUS20 KWNS 122251
SEL3
SPC WW 122251
TNZ000-130500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 393
NWS STORM PREDICTION CENTER NORMAN OK
550 PM CDT FRI JUN 12 2009

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

       SOUTHERN MIDDLE TENNESSEE

EFFECTIVE THIS FRIDAY AFTERNOON FROM 550 PM UNTIL MIDNIGHT CDT.

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 100
STATUTE MILES EAST AND WEST OF A LINE FROM 65 MILES EAST
NORTHEAST OF JACKSON TENNESSEE TO 95 MILES WEST OF CHATTANOOGA
TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).

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 388...WW 389...WW
390...WW 391...WW 392...

DISCUSSION...NRN PART OF LONG-LIVED DERECHO-PRODUCING MCS WILL
GLANCE SRN MIDDLE TN THIS EVE.  MCS WILL CONTINUE TO MERGE WITH
INDEPENDENT STORMS AHEAD OF IT.  IN ADDITION...WEAK SFC BOUNDARY
WITH LESS UNSTABLE AIR MASS TO ITS N WILL PERSIST ACROSS NRN MS/AL.
THESE FACTORS CAST SOME UNCERTAINTY AS TO HOW FAR N SVR THREAT WILL
EXTEND INTO MIDDLE TN.  NEVERTHELESS...A CONDITIONAL THREAT FOR HIGH
WIND/HAIL WILL EXIST WITH ANY STRONGER STORMS THAT REMAIN/DEVELOP N
OF THE TN BORDER UNTIL LATER THIS EVE.

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 28035.


...CORFIDI
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