MESOSCALE DISCUSSION 1240
   NWS STORM PREDICTION CENTER NORMAN OK
   0315 PM CDT THU JUN 21 2007
   
   AREAS AFFECTED...SERN SD/SWRN MN/FAR NWRN IA
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 433...
   
   VALID 212015Z - 212045Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 433
   CONTINUES.
   
   ISOLATED HAIL THREAT IS EXPECTED TO REMAIN POSSIBLE ACROSS SERN SD
   INTO SWRN MN/FAR NWRN IA THIS AFTERNOON WITH TSTMS...LIKELY
   ELEVATED...THAT DEVELOP ATOP MORE STABLE/CONVECTIVELY OVERTURNED AIR
   MASS IN WAKE OF MCS.  GIVEN DIMINISHING SEVERE THREAT IN THE SHORT
   TERM...WW 433 WILL BE ALLOWED TO EXPIRE AT 21Z.
   
   PARTS OF THIS REGION MAY HAVE AN INCREASED SEVERE THREAT LATER THIS
   EVENING WITH ANY ACTIVITY THAT DEVELOPS OVER THE NRN HIGH PLAINS AND
   TRACKS TO THE ESE.  PLEASE REFER TO SPC DAY 1 CONVECTIVE OUTLOOK FOR
   ADDITIONAL INFORMATION ABOUT THE POTENTIAL SEVERE WEATHER THREAT
   INTO THE EVENING/OVERNIGHT PERIOD.
   
   ..PETERS.. 06/21/2007
   
   
   ATTN...WFO...MPX...DMX...FSD...OAX...ABR...LBF...UNR...
   
   44639572 43999491 43089494 42279544 42139630 42699723
   42739812 42929961 43739954 44719875