Mesoscale Discussion 0958
   NWS Storm Prediction Center Norman OK
   0322 PM CDT Sun Jun 21 2020

   Areas affected...portions of northern Wisconsin and the Upper
   Peninsula of Michigan

   Concerning...Severe potential...Watch possible 

   Valid 212022Z - 212215Z

   Probability of Watch Issuance...40 percent

   SUMMARY...Strong to severe storms are expected to move eastward
   across northern Wisconsin and into the Upper Peninsula this
   afternoon and into the evening. Large hail and damaging wind gusts
   are possible, and a watch issuance is possible.

   DISCUSSION...Storms have developed across the western Great Lakes
   ahead of an upper-level trough spinning over south-central Canada.
   These storms developed along a pre-frontal trough with surface
   temperatures 70-80 F and dewpoints in the mid 50s to low 60s F. A
   corridor of better instability/buoyancy is along/ahead of the cold
   front with effective bulk shear of 30-40 knots also present. Per
   KDLH, transient supercell structures have been observed with some of
   the storms across northern Wisconsin and southern Lake Superior with
   radar signatures indicating the potential for large hail. Storms are
   also beginning to develop southwest from here back towards MSP.
   Large hail and damaging winds are possible through the afternoon and
   into the evening as the storms move eastward. Trends will continued
   to be monitored for a possible watch issuance this afternoon/early
   evening.

   ..Nauslar/Guyer.. 06/21/2020

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

   ATTN...WFO...MQT...GRB...DLH...ARX...MPX...

   LAT...LON   44739257 45439268 46729257 47029157 47169072 47158960
               46958906 46298908 45668929 44538996 44309059 44419157
               44739257