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Mesoscale Discussion 902
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   Mesoscale Discussion 0902
   NWS Storm Prediction Center Norman OK
   0309 PM CDT Sun May 28 2017

   Areas affected...Northwestern Pennsylvania...northern
   Ohio...southern Lower Michigan...and northern/central Indiana

   Concerning...Severe Thunderstorm Watch 292...

   Valid 282009Z - 282115Z

   The severe weather threat for Severe Thunderstorm Watch 292

   SUMMARY...The severe threat continues in WW 262 although a few areas
   in northwestern Indiana and southwestern Lower Michigan will have a
   decreased severe threat for the remainder of the afternoon.

   DISCUSSION...Scattered multicell thunderstorms have increased across
   much of WW 262, with a few linear segments organizing along and just
   ahead of a surface trough across south-central Lower Michigan and
   north-central Indiana.  Moderate instability and 30-40 knot deep
   shear will continue to sustain this activity ahead of the surface
   trough, with a continued threat of 1-1.5" hail and gusty winds
   approaching severe limits in/near the strongest storms.  Behind the
   surface trough, surface winds have shifted to the northwest along
   with some decrease in instability, leading to doubt as to whether
   convection west of this axis can attain severe thresholds.  Some of
   these areas of WW 292 may be cancelled before the originally
   scheduled 00Z expiration time.

   ..Cook.. 05/28/2017

   ...Please see for graphic product...


   LAT...LON   42488461 42808393 42918296 42728254 42478210 42288100
               42307993 41997947 41457928 40987967 40688101 40498216
               40568310 40698409 40698496 40408583 39988652 39568724
               39608772 39828786 40268766 40858692 41558623 41968579

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