

028 

WWUS20 KWNS 010448

SEL1

SPC WW 010448

ALZ000-LAZ000-MSZ000-011200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 1...RESENT

NWS STORM PREDICTION CENTER NORMAN OK

1045 PM CST FRI DEC 31 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF WEST CENTRAL AND NORTHWEST ALABAMA

       EXTREME NORTHEAST LOUISIANA

       CENTRAL AND NORTHEAST MISSISSIPPI



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1045 PM

UNTIL 600 AM 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 NORTH AND SOUTH OF A LINE FROM 50 MILES NORTHWEST OF

NATCHEZ MISSISSIPPI TO 25 MILES NORTHEAST OF TUSCALOOSA ALABAMA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 773. WATCH NUMBER 773 WILL NOT BE IN EFFECT AFTER

1045 PM CST.



DISCUSSION...A BAND OF SEVERE STORMS WILL LIKELY PERSIST OVERNIGHT

AND SAG SEWD IN ASSOCIATION WITH CONVECTIVE OUTFLOW AND EWD PROGRESS

OF THE SYNOPTIC COLD FRONT CROSSING THE MS RIVER.  A FEED OF 65-70 F

BOUNDARY LAYER DEWPOINTS AND THE NEWD EXTENSION OF MIDLEVEL LAPSE

RATES AOA 7 C/KM WILL MAINTAIN MUCAPE ON THE ORDER OF 500-1000 J/KG

INTO WRN AL AND 1000-2000 J/KG INTO CENTRAL/SW MS OVERNIGHT.

VERTICAL SHEAR WILL REMAIN FAVORABLE FOR SUPERCELLS WITH AN

ATTENDANT RISK FOR DAMAGING WINDS AND A COUPLE OF

TORNADOES...ESPECIALLY IN CENTRAL MS WHERE THE STRONGER

SURFACE-BASED INSTABILITY COINCIDES WITH THE ENHANCED SHEAR ALONG

THE LLJ AXIS.



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 24035.





...THOMPSON



217 

WWUS20 KWNS 010448

SEL1

SPC WW 010448

ALZ000-LAZ000-MSZ000-011200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 1

NWS STORM PREDICTION CENTER NORMAN OK

1045 PM CST FRI DEC 31 2010



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       PARTS OF WEST CENTRAL AND NORTHWEST ALABAMA

       EXTREME NORTHEAST LOUISIANA

       CENTRAL AND NORTHEAST MISSISSIPPI



EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 1045 PM

UNTIL 600 AM 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 NORTH AND SOUTH OF A LINE FROM 50 MILES NORTHWEST OF

NATCHEZ MISSISSIPPI TO 25 MILES NORTHEAST OF TUSCALOOSA ALABAMA.

FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH

OUTLINE UPDATE (WOUS64 KWNS WOU1).



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...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 773. WATCH NUMBER 773 WILL NOT BE IN EFFECT AFTER

1045 PM CST.



DISCUSSION...A BAND OF SEVERE STORMS WILL LIKELY PERSIST OVERNIGHT

AND SAG SEWD IN ASSOCIATION WITH CONVECTIVE OUTFLOW AND EWD PROGRESS

OF THE SYNOPTIC COLD FRONT CROSSING THE MS RIVER.  A FEED OF 65-70 F

BOUNDARY LAYER DEWPOINTS AND THE NEWD EXTENSION OF MIDLEVEL LAPSE

RATES AOA 7 C/KM WILL MAINTAIN MUCAPE ON THE ORDER OF 500-1000 J/KG

INTO WRN AL AND 1000-2000 J/KG INTO CENTRAL/SW MS OVERNIGHT.

VERTICAL SHEAR WILL REMAIN FAVORABLE FOR SUPERCELLS WITH AN

ATTENDANT RISK FOR DAMAGING WINDS AND A COUPLE OF

TORNADOES...ESPECIALLY IN CENTRAL MS WHERE THE STRONGER

SURFACE-BASED INSTABILITY COINCIDES WITH THE ENHANCED SHEAR ALONG

THE LLJ AXIS.



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 24035.





...THOMPSON

