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Mesoscale Discussion 754
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   Mesoscale Discussion 0754
   NWS Storm Prediction Center Norman OK
   0945 PM CDT Wed May 17 2017

   Areas affected...northeast IL

   Concerning...Severe potential...Watch possible 

   Valid 180245Z - 180345Z

   Probability of Watch Issuance...40 percent

   SUMMARY...The squall line over northwest IL will move into northeast
   IL later this evening.  Isolated severe gusts are possible.

   DISCUSSION...Radar mosaic shows a broken line of cells to the east
   of the Quad Cities with a continuous squall line over parts of
   northern IL into south-central WI.  The boundary layer has been slow
   to cool this evening in part to considerable mixing with
   temperatures slowly falling from the upper 70s into the middle 70s
   degrees F and dewpoints are around 60 F.  The KLOT VAD has shown an
   increase in 0.5-2.0 km flow and hodographs have become quite large. 
   Although the tornado risk is thought to be low, a nonzero risk for a
   brief/weak tornado may accompany any updraft with persistent
   rotation.  Isolated gusts 50-65 mph are possible with the stronger
   downdrafts which would result in wind damage.

   ..Smith/Hart.. 05/18/2017

   ...Please see www.spc.noaa.gov for graphic product...

   ATTN...WFO...LOT...

   LAT...LON   42448863 42458778 41788770 41348795 41148859 42448863 

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Page last modified: May 18, 2017
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