

028 

WWUS20 KWNS 251518

SEL4

SPC WW 251518

LAZ000-TXZ000-CWZ000-252200-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 694

NWS STORM PREDICTION CENTER NORMAN OK

920 AM CST TUE DEC 25 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTH-CENTRAL AND SOUTHWESTERN LOUISIANA

       SOUTHEAST TEXAS

       COASTAL WATERS



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 920 AM UNTIL

400 PM CST.



TORNADOES...HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND

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

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 45 MILES SOUTHWEST OF

HUNTSVILLE TEXAS TO 15 MILES NORTHEAST OF LAFAYETTE LOUISIANA.

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...CONTINUE...WW 692...WW 693...



DISCUSSION...SFC-BASED SUPERCELL/TORNADO THREAT FCST TO INCREASE AND

SHIFT EWD ACROSS WW AREA THROUGH AFTN.  WARM SECTOR EXPECTED TO

SHIFTS FARTHER INLAND AND BECOMES OVERLAIN BY STRENGTHENING

MID-UPPER FLOW AND ASCENT...PER SPC MESOSCALE DISCUSSION 2207.

POTENTIAL EXISTS FOR LARGE HAIL AND A FEW STG/DAMAGING TORNADOES

WITH ANY SUSTAINED/DISCRETE SUPERCELLS.  BOW-ECHO/QLCS CIRCULATIONS

ALSO MAY BECOME TORNADIC...IN ADDITION TO SVR GUST POTENTIAL.



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

SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE

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

500. MEAN STORM MOTION VECTOR 25040.





...EDWARDS

