[BNAWX] Severe Local Storm Watch and Watch Cancellation

[EMWIN Server]

WWUS20 KWNS 250148
SEL9
SPC WW 250148
ALZ000-ARZ000-LAZ000-MSZ000-TNZ000-250900-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 709
NWS STORM PREDICTION CENTER NORMAN OK
845 PM CDT SUN OCT 24 2010

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

       CENTRAL AND NORTHERN ALABAMA
       EXTREME SOUTHEAST ARKANSAS
       EXTREME NORTHEAST LOUISIANA
       CENTRAL AND NORTHERN MISSISSIPPI
       A SMALL PART OF SOUTHERN MIDDLE TENNESSEE

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 845 PM UNTIL
400 AM 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 75
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 45 MILES NORTHEAST
OF GADSDEN ALABAMA TO 40 MILES SOUTH OF MONTICELLO ARKANSAS.  FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).

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...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 708. WATCH NUMBER 708 WILL NOT
BE IN EFFECT AFTER 845 PM CDT. CONTINUE...WW 707...

DISCUSSION...A COUPLE OF SCENARIOS EXPECTED TO UNFOLD
OVERNIGHT...WITH LARGE HAIL AND DAMAGING WINDS POSSIBLE IN EACH.
FIRST...ONGOING STORMS ACROSS SE AR/NRN MS WILL LIKELY PERSIST AND
SPREAD EWD TOWARD NRN AL IN ADVANCE OF A SHORTWAVE TROUGH EJECTING
EWD FROM NE TX.  A BROAD UNDISTURBED WARM SECTOR WILL SUPPLY
SUFFICIENT INSTABILITY TO MAINTAIN THE SEVERE THREAT OVERNIGHT...IN
A VERTICAL SHEAR ENVIRONMENT SUPPORTIVE OF EMBEDDED SUPERCELLS AND
BOWS.  THE SECOND THREAT WILL BE A CONTINUATION OF THE SCATTERED
SEVERE STORM/SUPERCELL THREAT ACROSS AL WITHIN THE CONFLUENCE ZONE
AND CORRIDOR OF MOISTURE RETURNING NWD FROM THE GULF OF MEXICO.

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 25025.


...THOMPSON


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