MESOSCALE DISCUSSION 0702
   NWS STORM PREDICTION CENTER NORMAN OK
   1044 PM CDT MON MAY 24 2010
   
   AREAS AFFECTED...ERN SD INTO SWRN MN
   
   CONCERNING...SEVERE THUNDERSTORM WATCH 218...
   
   VALID 250344Z - 250515Z
   
   THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 218
   CONTINUES.
   
   THREAT FOR ISOLATED STRONG WIND GUSTS MAY PERSIST FOR ANOTHER HOUR
   OR TWO. CONVECTION WILL APPROACH THE ERN EDGE OF WW 218 ACROSS ERN
   SD BETWEEN 0430Z-05Z. THREAT FOR STRONG WIND GUSTS MAY SPREAD INTO
   SWRN MN BY 0430Z. HOWEVER...OVERALL TREND SHOULD BE FOR ACTIVITY TO
   CONTINUE WEAKENING...AND A WW EAST OF 218 IS NOT ANTICIPATED.
   
   LATE THIS EVENING A WEAKENING SQUALL LINE IS MOVING THROUGH ERN SD
   AT AROUND 40 KT. DEEP CONVECTION HAS BEGUN TO STRUGGLE TO SUSTAIN
   ITSELF...AND MUCH OF THE CONVECTION HAS SHIFTED BEHIND THE LEADING
   GUST FRONT. DEEPER FORCING ASSOCIATED WITH SHORTWAVE TROUGH OVER THE
   NRN HIGH PLAINS IS LIFTING NWWD AWAY FROM ERN SD. THIS ALONG WITH
   INCREASING CONVECTIVE INHIBITION ASSOCIATED WITH A STABILIZING
   BOUNDARY LAYER SUGGEST SHALLOW CONVERGENCE ALONG THE OUTFLOW
   BOUNDARY WILL NOT BE SUFFICIENT TO SUSTAIN ROBUST CONVECTION. STRONG
   WIND GUSTS WILL ACCOMPANY THE OUTFLOW BOUNDARY EWD INTO SWRN
   MN...BUT ANY REMAINING SEVERE THREAT IN THIS AREA IS EXPECTED TO
   GRADUALLY DIMINISH.
   
   ..DIAL.. 05/25/2010
   
   
   ATTN...WFO...MPX...FGF...FSD...ABR...
   
   LAT...LON   43049775 44479761 45289773 45849788 45789623 44549579
               42889683 43049775