[BNAWX] Severe Local Storm Watch and Watch Cancellation

[EMWIN Server]

WWUS20 KWNS 311746
SEL0
SPC WW 311746
ARZ000-ILZ000-KYZ000-MOZ000-TNZ000-010100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 770
NWS STORM PREDICTION CENTER NORMAN OK
1145 AM CST FRI DEC 31 2010

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

       FAR NORTHEAST ARKANSAS
       SOUTHERN ILLINOIS
       FAR WESTERN KENTUCKY
       SOUTHEAST MISSOURI
       WESTERN TENNESSEE

EFFECTIVE THIS FRIDAY MORNING AND EVENING FROM 1145 AM UNTIL 700
PM CST.

TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF MOUNT VERNON
ILLINOIS TO 40 MILES EAST SOUTHEAST OF WALNUT RIDGE ARKANSAS.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 767...WW 768...WW 769...

DISCUSSION...PRE-FRONTAL BAND OF TSTMS FROM STL SWD TO NW OF BVX IS
EXPECTED TO CONTINUE THROUGH THE AFTERNOON AND LIKELY INTENSIFY
WHILE INTERACTING WITH A WARMING/MOISTENING BOUNDARY LAYER WITH
MLCAPE APPROACHING 1500 J/KG /REF. 17Z LZK SOUNDING/.  GIVEN THAT
LLJ AXIS WILL REMAIN ALONG OR JUST E OF MS RIVER THROUGH THE DIURNAL
HEATING CYCLE...MORE THAN SUFFICIENT VERTICAL SHEAR WILL EXIST FOR
EMBEDDED SUPERCELL AND BOWING STRUCTURES CAPABLE OF DAMAGING
WINDS...A FEW TORNADOES...AND PERHAPS SOME HAIL.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.
MEAN STORM MOTION VECTOR 24035.


...MEAD
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