

922 

WWUS20 KWNS 251326

SEL2

SPC WW 251326

LAZ000-CWZ000-251900-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 692

NWS STORM PREDICTION CENTER NORMAN OK

725 AM CST TUE DEC 25 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN LOUISIANA

       COASTAL WATERS



EFFECTIVE THIS TUESDAY MORNING AND AFTERNOON FROM 725 AM UNTIL

100 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 50 STATUTE

MILES NORTH AND SOUTH OF A LINE FROM 5 MILES NORTHWEST OF

LAFAYETTE LOUISIANA TO 5 MILES SOUTH SOUTHEAST OF SLIDELL

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 691...



DISCUSSION...TSTMS HAVE RECENTLY INTENSIFIED OVER S-CNTRL

LA...APPARENTLY IN RESPONSE TO A LOW-LATITUDE PERTURBATION

TRANSLATING ENEWD ALONG THE IMMEDIATE COAST.  12Z LCH/LIX SOUNDINGS

SHOWED THE PRESENCE OF A MOIST AND MODERATELY UNSTABLE AIR MASS WITH

A WEAKENING CAP WITH EWD EXTENT ACROSS THE WATCH AREA.  GIVEN THE

PRESENCE OF ALREADY SUFFICIENT LOW-LEVEL AND DEEP-LAYER SHEAR FOR

SUPERCELLS...A RISK FOR TORNADOES AND LOCALLY DAMAGING WINDS WILL

EXIST WITH ANY SUSTAINED STORMS.



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 23030.





...MEAD

