MESOSCALE DISCUSSION 0762
   NWS STORM PREDICTION CENTER NORMAN OK
   0802 PM CDT THU MAY 01 2008
   
   AREAS AFFECTED...SOUTHEAST SD/NORTHWEST IA/SOUTHWEST MN
   
   CONCERNING...TORNADO WATCH 243...
   
   VALID 020102Z - 020215Z
   
   CORRECTED FOR MN GEOGRAPHIC DESCRIPTION
   
   THE SEVERE WEATHER THREAT FOR TORNADO WATCH 243 CONTINUES.
   
   TORNADO WATCH 243 CONTINUES UNTIL 04Z...WITH A RISK OF
   TORNADOES/LARGE HAIL.
   
   A MODESTLY UNSTABLE AIRMASS CONTINUES TO WRAP WEST-NORTHWESTWARD
   ACROSS THE SIOUXLAND IN VICINITY OF A 991 MB SURFACE LOW BETWEEN
   SIOUX FALLS/YANKTON SD...WITH A WARM FRONT EXTENDING EAST-SOUTHEAST
   INTO NORTH CENTRAL IA. IN VICINITY OF THE SURFACE LOW/WARM FRONT...A
   NUMBER OF SUPERCELLS WITH A HISTORY OF LARGE HAIL/SOME TORNADOES
   CONTINUE TO LIFT NORTHWARD ALONG/JUST NORTH OF THE WARM FRONT...WITH
   STORMS LIKELY TO CONTINUE EXPANDING ACROSS SOUTHWEST MN/FAR
   NORTHWEST IA OVER THE NEXT FEW HOURS. WITHIN THIS CORRIDOR...A
   STRONGLY SHEARED ENVIRONMENT WITH 0-1 KM SRH OF 250-400 M2/S2 PER
   SIOUX FALLS WSR-88D VWP WILL CONTINUE TO REMAIN VERY FAVORABLE FOR
   STORM ROTATION/POSSIBLE TORNADOES IN SPITE OF A MODESTLY UNSTABLE
   AIRMASS. THREAT INCLUDES AREAS ALONG I-90 IN SOUTHEAST SD/FAR
   SOUTHWEST MN INTO NORTHWEST IA OVER THE NEXT FEW HOURS.
   
   ..GUYER.. 05/02/2008
   
   
   ATTN...WFO...MPX...DMX...FSD...ABR...
   
   44759902 44489645 43789423 42449441 43359832