

704 

WWUS20 KWNS 260156

SEL6

SPC WW 260156

LAZ000-MSZ000-CWZ000-260800-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 66

NWS STORM PREDICTION CENTER NORMAN OK

855 PM CDT WED MAR 25 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHERN AND EASTERN LOUISIANA

       CENTRAL MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 855 PM

UNTIL 300 AM CDT.



TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND

GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE

AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 85 STATUTE

MILES EAST AND WEST OF A LINE FROM 25 MILES SOUTHWEST OF

INTRACOASTAL CITY LOUISIANA TO 55 MILES NORTHWEST OF JACKSON

MISSISSIPPI.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).



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 63...WW 64...WW 65...



DISCUSSION...WELL ORGANIZED LINE OF THUNDERSTORMS...IN THE FORM OF

SUPERCELLS AND BOW ECHOES...WILL CONTINUE RACING EWD ACROSS THE

LOWER MS RIVER VALLEY TONIGHT.  ISOLATED SUPERCELL DEVELOPMENT CAN

ALSO BE EXPECTED AHEAD OF THIS MAIN LINE OF STORMS AS STRONG SSWLY

LLJ OVERSPREADS THE AREA.  GREATEST LOW LEVEL SHEAR WILL REMAIN

CONCENTRATED WHERE THIS LINE STRADDLES SURFACE WARM FRONT...ALTHOUGH

SHEAR WILL REMAIN QUITE STRONG ACROSS THE WHOLE REGION.  WIND

DAMAGE...LARGE HAIL AND ISOLATED TORNADOES CAN ALL BE EXPECTED

OVERNIGHT ALONG AND AHEAD OF QUASI-LINEAR CONVECTIVE SYSTEM.  WIND

DAMAGE MAY BECOME PARAMOUNT IF ORGANIZED BOW ECHO CAN BE SUSTAINED.



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

SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE

WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO

500. MEAN STORM MOTION VECTOR 27040.





...EVANS

