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Mesoscale Discussion 1066
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   Mesoscale Discussion 1066
   NWS Storm Prediction Center Norman OK
   0135 AM CDT Sat Jun 17 2017

   Areas affected...Southern WI...eastern IA...and northwest and
   northern IL

   Concerning...Severe Thunderstorm Watch 342...

   Valid 170635Z - 170830Z

   The severe weather threat for Severe Thunderstorm Watch 342

   SUMMARY...Although a locally strong wind gust cannot be ruled out,
   the overall severe-weather threat should continue to diminish during
   the overnight.  Parts or much of WW 342 could be canceled prior to
   10Z (5 AM).

   DISCUSSION...Radar trends (including MRMS MESH and 7- and 9-km
   CAPPI) indicated overall weakening storm intensities with the
   ongoing convection across southern WI, much of eastern IA into
   western and northern portions of IL during the last 1-2 hours.  This
   weakening trend was further confirmed by decreasing lightning
   coverage within this activity.  The combination of convective
   overturning of the environment and strengthening surface-based
   inhibition through the night provides limited ability for stronger
   storms to develop as this area of showers and embedded thunderstorms
   spreads to the east-southeast.  Veering 850-mb winds will also limit
   convergence, with last several runs of the HRRR suggesting the
   ongoing weakening trend in storm intensity and coverage will persist
   as showers and some storms advance farther east-southeast into
   northern IL during the night and early morning.

   ..Peters.. 06/17/2017

   ...Please see for graphic product...


   LAT...LON   41699217 41829115 42609052 43208971 43208847 43238783
               42518776 41958810 41048923 40809028 40829056 41109124

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