[BNAWX] Severe Local Storm Watch and Watch Cancellation

[EMWIN Server]

WWUS20 KWNS 081420
SEL7
SPC WW 081420
ARZ000-ILZ000-KYZ000-MOZ000-TNZ000-082100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 267
NWS STORM PREDICTION CENTER NORMAN OK
920 AM CDT FRI MAY 8 2009

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

       PARTS OF NORTHEAST ARKANSAS
       PARTS OF SOUTHERN ILLINOIS
       WESTERN KENTUCKY
       SOUTHEAST MISSOURI
       MUCH OF WESTERN AND MIDDLE TENNESSEE

EFFECTIVE THIS FRIDAY MORNING AND AFTERNOON FROM 920 AM UNTIL 400
PM CDT.

TORNADOES...HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 105 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 90 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF WEST PLAINS
MISSOURI TO 35 MILES EAST SOUTHEAST OF CLARKSVILLE TENNESSEE.
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 266...

DISCUSSION...A MATURE VERY INTENSE DERECHO IS MOVING VERY RAPIDLY
ALONG THERMAL/INSTABILITY GRADIENT ACROSS MID MS VLY INTO TN AND
LOWER OH VALLEYS.  WITH A VERY MOIST UNSTABLE AIR MASS AND STRONG
VEERING SHEAR PROFILES...EMBEDDED TORNADIC SUPERCELLS WILL CONTINUE
TO BE ASSOCIATED WITH THE DERECHO ALONG WITH WIDESPREAD DAMAGING
WINDS.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 90 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
650. MEAN STORM MOTION VECTOR 27055.


...HALES
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