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Mesoscale Discussion 987
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   Mesoscale Discussion 0987
   NWS Storm Prediction Center Norman OK
   1200 PM CDT Sun Jun 11 2017

   Areas affected...Northern and central Wisconsin into Upper Michigan

   Concerning...Severe Thunderstorm Watch 313...

   Valid 111700Z - 111900Z

   The severe weather threat for Severe Thunderstorm Watch 313

   SUMMARY...The damaging wind threat should persist across the watch
   area through the afternoon.

   DISCUSSION...A long-lived bow echo continues to move rapidly
   eastward across north central WI, with slower trailing line segment
   extending into southwest WI. Surface observations indicate gradual
   heating via advection ahead of the line, with dewpoints rising as
   well. The greatest threat area should continue to be with the bow
   apex, which will track eastward along the lifting warm front.
   Transient areas of embedded rotation including a risk for a weak
   tornado may exist. Southern parts of the line currently contain more
   marginal wind, but the storms remain substantial, and conditions
   ahead of the line remain diurnally favorable for some further
   strengthening. Marginally severe hail is also possible with the
   stronger cores.

   ..Jewell.. 06/11/2017

   ...Please see for graphic product...


   LAT...LON   46099020 46068820 46058734 45898702 45578693 45258692
               44318736 43958762 43548772 43528830 43678919 43939039
               44149125 44419129 44819071 45049030 45269006 45559005

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