WATCHES: Severe Thunderstorm Watch Number 769

WWUS20 KWNS 151209
SEL9
SPC WW 151209
ARZ000-LAZ000-MSZ000-151800-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 769
NWS STORM PREDICTION CENTER NORMAN OK
710 AM CDT THU OCT 15 2009

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

EXTREME SOUTHERN ARKANSAS
NORTH AND NORTHEAST LOUISIANA
WEST CENTRAL MISSISSIPPI

EFFECTIVE THIS THURSDAY MORNING AND AFTERNOON FROM 710 AM UNTIL
100 PM CDT.

HAIL TO 1 INCH 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 70
STATUTE MILES EAST AND WEST OF A LINE FROM 60 MILES NORTHWEST OF
MONROE LOUISIANA TO 35 MILES WEST SOUTHWEST OF NATCHEZ
MISSISSIPPI. 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.

DISCUSSION...A CLUSTER OF THUNDERSTORMS OVER SRN AR WILL LIKELY
PERSIST AND MOVE SEWD ACROSS N/NE LA AND W CENTRAL MS THROUGH ABOUT
MIDDAY. THE CONVECTION WILL BE SUPPORTED BY AN INFLUX OF LOW-MID
70S BOUNDARY LAYER DEWPOINTS...MLCAPE VALUES NEAR 2000 J/KG...AND
INCREASINGLY UNIDIRECTIONAL DEEP LAYER SHEAR PROFILES IN ADVANCE OF
A WEAK WAVE ON THE SURFACE FRONT IN EXTREME NE TX. DAMAGING WINDS
SHOULD BE THE PRIMARY SEVERE STORM THREAT THROUGH THE MORNING.

AVIATION...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 550. MEAN STORM MOTION
VECTOR 31025.

...THOMPSON

+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-
To unsubscribe from WX-STORM send e-mail to LISTSERV@LISTSERV.ILLINOIS.EDU with
"unsub wx-storm" in the body of your message. For more information write cnovy@cox.net.