[BNAWX] Severe Local Storm Watch and Watch Cancellation MSG

[EMWIN Server]

WWUS20 KWNS 221858
SEL8
SPC WW 221858
ARZ000-MSZ000-TNZ000-230200-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 68
NWS STORM PREDICTION CENTER NORMAN OK
1255 PM CST TUE MAR 22 2005

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

       EASTERN AND NORTHEASTERN ARKANSAS
       NORTHWEST MISSISSIPPI
       EXTREME SOUTHWEST TENNESSEE

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 1255 PM UNTIL
800 PM CST.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 80
STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES WEST NORTHWEST
OF WALNUT RIDGE ARKANSAS TO 35 MILES SOUTH SOUTHEAST OF GREENWOOD
MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU8).

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 63...WW 64...WW 65...WW
66...WW 67...

DISCUSSION...THUNDERSTORMS ARE EXPECTED TO DEVELOP IN THE NEXT FEW
HOURS...BEGINNING NEAR THE SURFACE LOW IN NW AR AND SPREADING
EWD/SEWD ACROSS CENTRAL AND ERN AR THROUGH THE AFTERNOON...REACHING
NW MS AND SW TN LATER THIS AFTERNOON AND EVENING.  SURFACE HEATING
BENEATH THE MID LEVEL DRY SLOT...ALONG WITH RELATIVELY COLD MID
LEVEL TEMPERATURES AND STEEP LAPSE RATES...HAS RESULTED IN THE
DEVELOPMENT OF SBCAPE VALUES NEAR 1500 J/KG ACROSS ERN AR AND NW MS.
 ADDITIONAL DESTABILIZATION IS EXPECTED DURING THE AFTERNOON...WHICH
WILL SUPPORT AN INCREASING THREAT FOR SEVERE STORMS.  THOUGH
VERTICAL SHEAR WILL ALSO BE SUFFICIENT FOR LOW-TOPPED
SUPERCELLS...LARGE HAIL APPEARS TO BE THE MAIN THREAT.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 24025.


...THOMPSON

;362,0901 330,0882 330,0911 362,0931;
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