[BNAWX] Severe Local Storm Watch and Watch Cancellation

[EMWIN Server]

WWUS20 KWNS 051920
SEL1
SPC WW 051920
KYZ000-NCZ000-TNZ000-060300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 471
NWS STORM PREDICTION CENTER NORMAN OK
320 PM EDT THU JUL 5 2012

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

       SOUTH CENTRAL KENTUCKY
       EXTREME WESTERN NORTH CAROLINA
       MIDDLE AND EASTERN TENNESSEE

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 320 PM UNTIL
1100 PM EDT.

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 75
STATUTE MILES EAST AND WEST OF A LINE FROM 25 MILES NORTHWEST OF
LONDON KENTUCKY TO 15 MILES EAST OF CHATTANOOGA TENNESSEE.  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 469...WW 470...

DISCUSSION...A LARGE CLUSTER OF SEVERE STORMS ACROSS ERN KY WILL
CONTINUE TO DEVELOP SWD/SWWD INTO A HOT/DEEPLY MIXED AIR MASS ACROSS
TN...WHERE MODERATE INSTABILITY IS PRESENT.  THE THERMODYNAMIC
ENVIRONMENT IS FAVORABLE FOR DAMAGING DOWNBURSTS...AS WELL AS LARGE
HAIL NEAR SEVERE LIMITS.  THE SEVERE THREAT IS EXPECTED TO PERSIST
UNTIL LATE EVENING WHEN THE BOUNDARY LAYER BEGINS TO STABILIZE.

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 550. MEAN STORM
MOTION VECTOR 02025.


...THOMPSON

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