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Mesoscale Discussion 759
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   MESOSCALE DISCUSSION 0759
   NWS STORM PREDICTION CENTER NORMAN OK
   0636 PM CDT THU MAY 01 2008
   
   AREAS AFFECTED...SOUTHEAST SD/NORTHWEST IA/SOUTHWEST MN
   
   CONCERNING...TORNADO WATCH 243...
   
   VALID 012336Z - 020030Z
   
   CORRECTED FOR INCORRECT WATCH TYPE HEADER
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 243 CONTINUES.
   
   TORNADO WATCH 243 CONTINUES ACROSS SOUTHEAST SD/SOUTHWEST
   MN/NORTHWEST IA UNTIL 04Z...WITH A RISK OF ISOLATED TORNADOES AND
   LARGE HAIL INCREASE THROUGH EARLY EVENING.
   
   GRADUAL AIRMASS DESTABILIZATION CONTINUES TO OCCUR ACROSS SOUTHEAST
   SD/NORTHWEST IA INTO SOUTHWEST MN IN VICINITY OF SURFACE TRIPLE
   POINT. LATEST SURFACE ANALYSIS FEATURES A 991 MB SURFACE LOW JUST
   EAST OF YANKTON SD...WITH ATTENDANT WARM FRONT EXTENDING FROM FAR
   SOUTHEAST SD INTO NORTHERN IA. ONGOING STORMS ACROSS SOUTHEAST SD
   /WITH HISTORY OF LARGE HAIL/ WILL CONTINUE TO LIFT NORTHWARD OVER
   NEXT FEW HOURS. OF NOTE...STORM IN TURNER COUNTY SD MAY POSE A
   TORNADO THREAT IN THE SHORT TERM GIVEN PROXIMITY TO SURFACE LOW/WARM
   FRONT AND CORRESPONDING ENLARGED 0-1 KM SRH AMIDST BACKED EASTERLY
   LOW LEVEL FLOW.
   
   ..GUYER.. 05/01/2008
   
   
   ATTN...WFO...MPX...DMX...FSD...OAX...
   
   44119800 43699494 42739393 42189501 42749716 43409865
   44019833 
   
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