

914 

WWUS20 KWNS 031533

SEL1

SPC WW 031533

LAZ000-MSZ000-CWZ000-032300-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 1

NWS STORM PREDICTION CENTER NORMAN OK

935 AM CST SAT JAN 3 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHEAST LOUISIANA

       SOUTHERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS SATURDAY MORNING AND AFTERNOON FROM 935 AM UNTIL

500 PM CST.



HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70

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



THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 85

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES NORTH

NORTHWEST OF INTRACOASTAL CITY LOUISIANA TO 10 MILES EAST

SOUTHEAST OF GULFPORT MISSISSIPPI.  FOR A COMPLETE DEPICTION OF

THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS

WOU1).



REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE

FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY

DO PRODUCE TORNADOES.



DISCUSSION...SCATTERED THUNDERSTORMS ARE INCREASING ACROSS SOUTH

CENTRAL LA AHEAD OF APPROACHING UPPER TROUGH.  THESE STORMS ARE

FORECAST TO CONTINUE TO INTENSIFY THIS MORNING AND EARLY

AFTERNOON...SPREADING EAST-NORTHEASTWARD.  MUCAPE VALUES 1500 J/KG

AND SUFFICIENT EFFECTIVE SHEAR WILL PROMOTE ORGANIZED AND/OR

SUPERCELL STORMS CAPABLE OF HAIL AND DAMAGING WINDS.



AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT

TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM

MOTION VECTOR 25030.





...HART

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