Mesoscale Discussion 0863
   NWS Storm Prediction Center Norman OK
   1134 PM CDT Mon May 20 2024

   Areas affected...northern Iowa and southern Minnesota

   Concerning...Severe Thunderstorm Watch 272...

   Valid 210434Z - 210600Z

   The severe weather threat for Severe Thunderstorm Watch 272
   continues.

   SUMMARY...A new severe weather watch does not appear needed, but WW
   272 could be locally extended in time for an hour or two. 
   Thunderstorms are expected to remain rather disorganized with
   diminishing intensities into the overnight hours.

   DISCUSSION...Ongoing storms are generally embedded with rather
   modest southwesterly deep-layer mean flow on the order of 20 kt or a
   bit less.  But, due to pronounced veering of wind fields with
   height, vertical shear may be contributing to the maintenance of
   vigorous convection.  Even as low-level warm advection maintains
   lift into the overnight hours, it does appear, though, that the risk
   for severe hail and wind will begin to wane with further
   boundary-layer cooling.

   ..Kerr.. 05/21/2024

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...ARX...MPX...DMX...FSD...

   LAT...LON   42889602 43359555 44169324 44159209 43359195 42889250
               42259460 42159550 42889602