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605 

WWUS20 KWNS 301937

SEL6

SPC WW 301937

LAZ000-MSZ000-CWZ000-010100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 656

NWS STORM PREDICTION CENTER NORMAN OK

135 PM CST SUN SEP 30 2012



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       SOUTHEAST LOUISIANA

       SOUTHERN MISSISSIPPI

       COASTAL WATERS



EFFECTIVE THIS SUNDAY AFTERNOON AND EVENING FROM 135 PM UNTIL 700

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 80 STATUTE

MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH NORTHWEST OF

PINE BELT MISSISSIPPI TO 30 MILES WEST SOUTHWEST OF SLIDELL

LOUISIANA.  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.



DISCUSSION...STORMS DEVELOPING AHEAD OF COLD FRONT AND EAST OF NEWD

ADVANCING MESOLOW CIRCULATION MAY BECOME CAPABLE OF PRODUCING

ISOLATED TORNADOES AND DAMAGING WIND GUSTS. MLCAPE FROM 1000-1500

J/KG AND 0-1 KM STORM RELATIVE HELICITY FROM 150-200 M2/S2 WILL

SUPPORT THE POTENTIAL FOR ORGANIZED STORMS INCLUDING LOW LEVEL

MESOCYCLONES AND BOWING SEGMENTS AS ACTIVITY CONTINUES THROUGH THE

WARM SECTOR.



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 400.

MEAN STORM MOTION VECTOR 22030.





...DIAL

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