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Mesoscale Discussion 776
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   Mesoscale Discussion 0776
   NWS Storm Prediction Center Norman OK
   0630 AM CDT Fri May 19 2017

   Areas affected...Southern Illinois

   Concerning...Severe Thunderstorm Watch 245...

   Valid 191130Z - 191300Z

   The severe weather threat for Severe Thunderstorm Watch 245

   SUMMARY...A few strong wind gusts remain possible, but a weakening
   trend is expected this morning.

   DISCUSSION...A line of severe storms with damaging winds passed
   through the St. Louis area with measured severe gusts which persist
   across the river. The main threat for severe wind gusts should be
   along and south of the main e-w oriented synoptic front, which has
   also been reinforced by outflow. North of this boundary,
   temperatures are only in the 50s, with northeast winds. To the
   south, a much warmer air mass remains at the surface, supportive of
   stronger winds reaching the surface.

   Recent radar trends suggest weakening is beginning to take place,
   and, the possible threat area is dwindling in size. Therefore, a new
   watch may not be required in the short term.

   ..Jewell.. 05/19/2017

   ...Please see for graphic product...


   LAT...LON   39338974 39408799 39168770 38868759 38508777 38278878
               38178957 38338968 38578955 39198963 39338974 

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