

702 

WWUS20 KWNS 311934

SEL2

SPC WW 311934

LAZ000-MSZ000-010200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 772

NWS STORM PREDICTION CENTER NORMAN OK

135 PM CST FRI DEC 31 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       NORTHEAST AND CENTRAL LOUISIANA

       SOUTHERN MISSISSIPPI



EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 135 PM UNTIL 800

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 65 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH OF NATCHEZ

MISSISSIPPI TO 40 MILES SOUTH SOUTHEAST OF ALEXANDRIA LOUISIANA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU2).



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 767...WW 769...WW

770...WW 771...



DISCUSSION...SUPERCELLS ARE QUICKLY DEVELOPING WITHIN WAA REGIME

OVER CNTRL LA THIS AFTERNOON.  18Z LCH SOUNDING INDICATED THE

PRESENCE OF A MOIST...MODERATELY UNSTABLE ENVIRONMENT WITH MLCAPE OF

AROUND 2000 J/KG.  WHEN COUPLED WITH A RATHER STRONGLY SHEARED

KINEMATIC ENVIRONMENT...SETUP WILL FAVOR THE CONTINUED DEVELOPMENT

OF ROTATING STORMS CAPABLE OF TORNADOES...DAMAGING WINDS AND SOME

HAIL.



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 23035.





...MEAD

