URGENT – IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 796
NWS STORM PREDICTION CENTER NORMAN OK
125 PM CST TUE DEC 8 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
PARTS OF SOUTHEAST ARKANSAS
PARTS OF NORTHERN AND CENTRAL LOUISIANA
PARTS OF CENTRAL AND SOUTHERN MISSISSIPPI
EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 125 PM UNTIL
900 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 95 STATUTE
MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTHEAST OF
ALEXANDRIA LOUISIANA TO 30 MILES NORTHWEST OF GREENWOOD
MISSISSIPPI. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).
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.
DISCUSSION…APPROACH OF POWERFUL UPPER JET AND S/WV TROUGH
RESULTING IN RAPID RETURN OF LOW LEVEL MOISTURE ACROSS LOWER MS
VALLEY AS CYCLOGENESIS TAKES PLACE TO THE NORTH. THUNDERSTORMS
EXPECTED TO INCREASE IN NUMBER AND INTENSITY EWD ACROSS WATCH AREA.
WITH STRONG…VEERING DEEP LAYER SHEAR PROFILES AND MLCAPES IN WARM
SECTOR TO 1000 J/KG…SUPERCELLS INCLUDING TORNADO POTENTIAL WILL
RAMP UP REMAINDER OF AFTERNOON THRU THE EVENING.
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 500.
MEAN STORM MOTION VECTOR 23040.
