Mesoscale Discussion 1461
   NWS Storm Prediction Center Norman OK
   0517 PM CDT Mon Aug 10 2020

   Areas affected...southern lower Michigan...Indiana...southern
   Illinois...east-central Missouri...northern Kentucky...and western
   Ohio

   Concerning...Severe Thunderstorm Watch 428...429...

   Valid 102217Z - 110015Z

   The severe weather threat for Severe Thunderstorm Watch 428, 429
   continues.

   SUMMARY...Widespread damaging wind gusts will continue across WW 428
   and 429, and eventually will spread into adjacent/downstream areas. 
   One or more new WW issuances may be needed to cover the fast-moving
   threat.

   DISCUSSION...Latest radar loop shows a well-defined bowing MCS
   moving quickly eastward/southeastward at 40 to 45 kt across the
   Midwest, with the main convective line now east of Chicago, and
   moving toward Grand Rapids/Indianapolis/St. Louis.  

   While moderate instability remains just downstream of the
   convection, which will allow storms to remain intense over the next
   hour, instability lessens with eastward and southeastward extent
   east of the existing watches.  Still, given the very well-organized
   nature of this convective system, an organized/bowing band is likely
   to continue east and southeast of the existing watches.  While
   severe risk should begin to diminish/become more isolated this
   evening, a new WW issuance -- into eastern lower Michigan and
   western Ohio, may be required.  Some risk may also spread southeast
   of the existing watches across the Ohio River into northern Kentucky
   as well --- which could also require WW consideration.

   ..Goss.. 08/10/2020

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

   ATTN...WFO...CLE...ILN...DTX...LMK...IWX...GRR...IND...PAH...
   LOT...ILX...LSX...

   LAT...LON   43048691 43378580 43498416 43448286 40488291 38608382
               37848869 38179132 38959084 39778880 40538723 41788671
               42968704 43048691