

988 

WWUS20 KWNS 181555

SEL8

SPC WW 181555

LAZ000-MSZ000-CWZ000-182100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 28

NWS STORM PREDICTION CENTER NORMAN OK

955 AM CST SAT FEB 18 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST LOUISIANA

       EXTREME SOUTHERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 955 AM UNTIL

300 PM CST.



TORNADOES...HAIL TO 1.5 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 110 STATUTE

MILES EAST AND WEST OF A LINE FROM 30 MILES NORTHWEST OF SLIDELL

LOUISIANA TO 45 MILES SOUTHEAST OF HOUMA LOUISIANA.  FOR A

COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE

UPDATE (WOUS64 KWNS WOU8).



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.



DISCUSSION...STG UPR TROUGH ACRS TX ATTM WILL EJECT NEWD ACROSS

ARKLATEX THROUGH TODAY WITH 12H 500MB HGT FALLS OF 60-90M AFFECTING

NWRN GULF COAST AND LOWER MS VALLEY THROUGH TONIGHT. WELL-FORMED

MESOLOW AND ASSOCIATED BOW/LEWP STRUCTURE WAS LEADING THE SYNOPTIC

CYCLONE AND IS EXPECTED TO MAINTAIN STRUCTURE AND INTENSITY AS IT

TRACKS EAST ALONG WARM FRONT. WITH SHEAR AND SURFACE-BASED

INSTABILITY LIKELY TO INCREASE AHEAD OF THIS SMALLER-SCALE

DISTURBANCE THE THREAT FOR DAMAGING WINDS AND A COUPLE OF TORNADOES

SHOULD LIKEWISE INCREASE ACROSS THE MS DELTA REGION THROUGH THIS

AFTERNOON.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

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

450. MEAN STORM MOTION VECTOR 24045.





...CARBIN

