Mesoscale Discussion 1251
   NWS Storm Prediction Center Norman OK
   0446 PM CDT Thu Jun 13 2024

   Areas affected...Southern Great Lakes

   Concerning...Severe Thunderstorm Watch 408...

   Valid 132146Z - 132315Z

   The severe weather threat for Severe Thunderstorm Watch 408
   continues.

   SUMMARY...Broken squall line will propagate southeast this evening
   with an attendant risk for locally damaging winds and some hail
   risk.

   DISCUSSION...Great Lakes short-wave trough is progressing across WI
   toward Lower MI this evening. This feature appears to be partly
   responsible for scattered strong/severe thunderstorms that have
   developed along a prefrontal boundary that is draped from southern
   Lower MI into northeast IL. This boundary is coincident with the
   primary axis of instability, albeit notably weaker across northern
   IN/southern MI. This activity will soon advance beyond the greater
   zone of instability and gradual weakening is expected as the broken
   squall line shifts into a region of lower surface dew points.

   ..Darrow.. 06/13/2024

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

   ATTN...WFO...IWX...GRR...LOT...ILX...

   LAT...LON   42128905 43288446 41558447 40388904 42128905