[BNAWX] Severe Local Storm Watch and Watch Cancellation

[EMWIN Server]

WWUS20 KWNS 020109
SEL7
SPC WW 020109
ARZ000-MOZ000-MSZ000-TNZ000-020900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 127
NWS STORM PREDICTION CENTER NORMAN OK
805 PM CDT SAT MAY 1 2010

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

       EAST CENTRAL AND NORTHEAST ARKANSAS
       THE MISSOURI BOOTHEEL
       NORTHERN MISSISSIPPI
       WESTERN TENNESSEE

EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 805 PM
UNTIL 400 AM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

DESTRUCTIVE TORNADOES...LARGE HAIL TO 2.5 INCHES IN DIAMETER...
THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE
POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES NORTH OF DYERSBURG
TENNESSEE TO 35 MILES SOUTHWEST OF OXFORD MISSISSIPPI.  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 125...WW 126...

DISCUSSION...DISCRETE SUPERCELLS NOW MOVING INTO ERN AR WILL PERSIST
OVERNIGHT WHILE MOVING NEWD TOWARD NE AR...WRN TN...AND NW MS...IN
ADVANCE OF AN EJECTING MIDLEVEL TROUGH AND SURFACE LOW.  THE
SUPERCELLS WILL MOVE INTO AN ENVIRONMENT OF STRONGER LOW-LEVEL SHEAR
COMPARED TO FARTHER W IN AR...AND VERTICAL SHEAR WILL FURTHER
INCREASE TONIGHT WITH A STRENGTHENING LLJ.  MEANWHILE...THE LOW
LEVELS ARE DESTABILIZING ACROSS MS/WRN TN IN THE WAKE OF EARLIER
CONVECTION...SETTING THE STAGE FOR SURFACE-BASED STORMS WELL INTO
THE NIGHT WITHIN A VERY MOIST AND STRONGLY SHEARED ENVIRONMENT.  THE
NET RESULT WILL BE THE POTENTIAL FOR SEVERAL LONG-TRACK SUPERCELLS
CAPABLE OF PRODUCING STRONG TORNADOES.  FARTHER E/SE INTO TN/NE
MS...THE TORNADO THREAT WILL BE SOMEWHAT LESS THAN AREAS NEAR THE MS
RIVER...THOUGH SUPERCELLS AND COUPLE OF TORNADOES WILL BE POSSIBLE
AS CONVECTION FORMS ALONG THE RETREATING OUTFLOW BOUNDARY.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24040.


...THOMPSON

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