Chicago setting up for a wet and stormy night as severe thunderstorms approach the north portions of the Metro area

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Mesoscale Discussion 1178
   NWS Storm Prediction Center Norman OK
   0753 PM CDT Wed Jun 28 2017

   Areas affected...Northeast IA...Southern WI...Northern IL

   Concerning...Tornado Watch 375...377...378...

   Valid 290053Z - 290230Z

   The severe weather threat for Tornado Watch 375, 377, 378 continues.

   SUMMARY...Severe threat continues.

   DISCUSSION...MCS continues to mature as it becomes elongated in an
   east-west fashion from northeast IA, east along the WI/IL border.
   This complex of storms is sagging south at roughly 15kt with an
   eastward surge on the order of 30kt along the leading squall line.
   Given this speed/movement, it appears strong convection will
   approach the northern Chicago metro between 0200-0230z and around
   0200z for the near-lake MI region of southeast WI. As the complex
   becomes oriented more east-west there will be a propensity for
   training across this region deep into the evening hours.