Storm Prediction Center Mesoscale Discussion 996

   Mesoscale Discussion 0996
   NWS Storm Prediction Center Norman OK
   1133 PM CDT Fri Jun 05 2026

   Areas affected...southern Iowa

   Concerning...Severe Thunderstorm Watch 276...

   Valid 060433Z - 060600Z

   The severe weather threat for Severe Thunderstorm Watch 276
   continues.

   SUMMARY...Severe storms continue across WW276. A stronger cluster
   moving in from the west should transition the threat to mostly
   damaging winds. Some hail and a brief tornado remain possible.

   DISCUSSION...Over the last several hours, severe storms, including a
   few supercells have organized across portions of southern IA. These
   storms have been largely stationary, tied to stronger ascent near a
   diffuse surface boundary. The environment remains quite unstable and
   sufficiently sheared for supercell structures. This will support a
   continued risk for hail and isolated damaging gusts.

   A larger convective cluster is moving eastward out of WW275. These
   storms have a history of producing severe wind gusts, and will
   interact with the ongoing storms over IA in the next few hours.
   Strong outflow from this forward propagating cluster will likely
   favor a damaging wind risk as convection consolidates and the cold
   pool continues to strengthen. A brief tornado also remains possible
   as strong outflow interacts with any of the more persistent
   supercells. Thus, the severe risk will continue for much of WW276
   this evening and early overnight period.

   ..Lyons.. 06/06/2026

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

   ATTN...WFO...DVN...DMX...EAX...OAX...

   LAT...LON   41449513 41799245 41669151 41239126 40919148 40709189
               40659269 40629370 40519464 40529498 40549522 40619551
               41449513 

   MOST PROBABLE PEAK TORNADO INTENSITY...UP TO 90 MPH
   MOST PROBABLE PEAK WIND GUST...55-70 MPH
   MOST PROBABLE PEAK HAIL SIZE...1.00-1.75 IN