[BNAWX] Severe Local Storm Watch and Watch Cancellation

[EMWIN Server]

WWUS20 KWNS 111341
SEL4
SPC WW 111341
TNZ000-111900-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 374
NWS STORM PREDICTION CENTER NORMAN OK
840 AM CDT THU JUN 11 2009

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

       MIDDLE AND EASTERN TENNESSEE

EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 840 AM UNTIL
200 PM CDT.

HAIL TO 2 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 55
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 55 MILES SOUTH
SOUTHWEST OF CLARKSVILLE TENNESSEE TO 40 MILES EAST SOUTHEAST OF
CROSSVILLE TENNESSEE.  FOR A COMPLETE DEPICTION OF THE WATCH SEE
THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).

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 373...

DISCUSSION...A WELL-DEFINED MCV IS MOVING EWD FROM WRN INTO MIDDLE
TN THIS MORNING.  THE 12Z SOUNDING FROM NASHVILLE SHOWED MLCAPE OF
ALMOST 3000 J/KG AND MINIMAL CONVECTIVE INHIBITION...WHILE THE
MEMPHIS VWP REVEALED A 40-50 KT JET AS LOW AS 2 KM AGL IN
ASSOCIATION WITH THE MCV.  THIS COMBINATION OF INGREDIENTS WILL
SUPPORT CONTINUED THUNDERSTORM DEVELOPMENT ACROSS MIDDLE TN AND
SPREADING EWD INTO ERN TN LATER THIS MORNING INTO EARLY
AFTERNOON...WHERE THE STRONGER STORMS WILL BE CAPABLE OF PRODUCING
DAMAGING WINDS AND LARGE HAIL.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 27030.


...THOMPSON


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