Storm Prediction Center Mesoscale Discussion 303

   Mesoscale Discussion 0303
   NWS Storm Prediction Center Norman OK
   0154 AM CDT Tue Mar 31 2026

   Areas affected...eastern Iowa and northern Illinois

   Concerning...Severe Thunderstorm Watch 77...

   Valid 310654Z - 310830Z

   The severe weather threat for Severe Thunderstorm Watch 77
   continues.

   SUMMARY...An isolated large hail/wind threat remains.

   DISCUSSION...Storms which produced some large hail and damaging wind
   gusts earlier have now mostly weakened and congealed into a mass of
   mostly sub-severe storms. A few stronger cells, such as the one
   currently near Iowa City, may pose a isolated large hail/damaging
   wind threat. However, the overall threat appears to be waning.
   Therefore, given the remaining isolated/marginal threat, watch 77
   will likely be allowed to expire at 08Z, even if an isolated threat
   may persist after this time.

   ..Bentley/Mosier.. 03/31/2026

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

   ATTN...WFO...LOT...ILX...MKX...DVN...

   LAT...LON   41629204 42079109 42468961 42588903 42608860 42508796
               42538707 41798692 41248787 40958963 40949110 40979194
               41239211 41629204 

   MOST PROBABLE PEAK WIND GUST...UP TO 60 MPH
   MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN