

452 

WWUS20 KWNS 061047

SEL3

SPC WW 061047

ARZ000-LAZ000-MSZ000-TNZ000-061800-



URGENT - IMMEDIATE BROADCAST REQUESTED

SEVERE THUNDERSTORM WATCH NUMBER 253

NWS STORM PREDICTION CENTER NORMAN OK

545 AM CDT WED MAY 6 2009



THE NWS STORM PREDICTION CENTER HAS ISSUED A

SEVERE THUNDERSTORM WATCH FOR PORTIONS OF



       SOUTHERN ARKANSAS

       NORTHEAST LOUISIANA

       NORTHEAST INTO CENTRAL MISSISSIPPI

       FAR SOUTHERN MIDDLE TENNESSEE



EFFECTIVE THIS WEDNESDAY MORNING AND AFTERNOON FROM 545 AM UNTIL

100 PM CDT.



HAIL TO 2 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 60

STATUTE MILES NORTH AND SOUTH OF A LINE FROM 35 MILES EAST

NORTHEAST OF COLUMBUS MISSISSIPPI TO 30 MILES NORTHWEST OF MONROE

LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU3).



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.



OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES

SEVERE THUNDERSTORM WATCH NUMBER 248...TORNADO WATCH NUMBER 250.

WATCH NUMBER 248 250 WILL NOT BE IN EFFECT AFTER 545 AM CDT.

CONTINUE...WW 251...WW 252...



DISCUSSION...LARGE LINEAR MCS WITH EMBEDDED BOWING SEGMENTS AND

ISOLATED SUPERCELLS WILL CONTINUE MOVING SSEWD ACROSS WW THROUGH THE

EARLY AFTERNOON...WITH STRONGEST EWD MOVING BOW SEGMENTS MOVING INTO

AL AND ACROSS SRN MIDDLE TN THIS MORNING.  SHEAR WILL REMAIN VERY

STRONG AND AN ALREADY MODERATELY UNSTABLE AIR MASS WILL FURTHER

DESTABILIZE WITH AFTERNOON HEATING.  PRIMARY SEVERE THREAT WILL BE

FROM DAMAGING WINDS AND ISOLATED LARGE HAIL.  HOWEVER...AT LEAST

SOME TORNADO THREAT MAY EVOLVE AS CAP ERODES THROUGH THE MORNING

ACROSS MS AND SHOULD STORMS BECOME DISCRETE AWAY FROM SURGING

OUTFLOW BOUNDARY THEN PORTIONS OF THE WATCH MAY NEED TO BE REPLACED

BY A TORNADO WATCH LATER TODAY.



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

TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60

KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM

MOTION VECTOR 28035.





...EVANS

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