

671 

WWUS20 KWNS 130531

SEL4

SPC WW 130531

ARZ000-LAZ000-MSZ000-TXZ000-131200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 4

NWS STORM PREDICTION CENTER NORMAN OK

1130 PM CST SAT JAN 12 2013



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN AND EASTERN ARKANSAS

       NORTHERN LOUISIANA

       NORTHWESTERN MISSISSIPPI

       SMALL PART OF EAST TEXAS



EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1130 PM

UNTIL 600 AM CST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 75 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 70 STATUTE

MILES EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHWEST OF

NATCHITOCHES LOUISIANA TO 40 MILES NORTHWEST OF OXFORD

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU4).



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 3. WATCH NUMBER 3 WILL NOT BE IN EFFECT AFTER 1130

PM CST.



DISCUSSION...BAND OF NEAR-FRONTAL CONVECTION BECOMING BETTER

ORGANIZED ACROSS THIS REGION...WHILE IMPINGING UPON WARM-SECTOR

CAPE-SHEAR PARAMETER SPACE THAT WILL REMAIN FAVORABLE FOR SVR

THROUGH MOST OF PRE-DAWN HOURS.  REF MESOSCALE DISCUSSION 21 FOR

MORE INITIAL DETAILS.  DAMAGING GUSTS ARE POSSIBLE...AND A TORNADO

THREAT DOES EXIST WITH ANY QLCS MESOVORTICES OR EMBEDDED SUPERCELLS.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.

MEAN STORM MOTION VECTOR 23040.





...EDWARDS

