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Mesoscale Discussion 338
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   Mesoscale Discussion 0338
   NWS Storm Prediction Center Norman OK
   0827 AM CDT Sun Apr 14 2019

   Areas affected...Portions of Western/Central Illinois

   Concerning...Heavy snow 

   Valid 141327Z - 141630Z

   SUMMARY...A few areas of heavy snow are possible along with
   potential for thundersnow. Heaviest snow rates will be around 1
   inch/hour and last until 10-11 AM CDT.

   DISCUSSION...A mid-level shortwave, visible on moisture channel
   imagery, is now lifting through Missouri into the Upper Midwest. A
   band of heavier snow associated with 850-700 mb frontogenesis is now
   occurring from near Quincy, IL to northeast of Peoria, IL. As
   mid-level ascent continues to move into the region and 850/700 mb
   cold air advection increases, profiles should become more conducive
   to heavier snowfall rates, perhaps approaching 1 inch/hour in some
   places. Furthermore, weak instability at cloud top -- no more than
   100-200 J/kg -- noted on the 12Z ILX sounding will support
   convective elements with a few instances of thundersnow. Per NLDN
   data, this has already occurred in the vicinity of Peoria over the
   last hour or two with the ASOS also reporting heavy snow. The band
   will continue to lift to the northeast through the day and the
   heaviest snow should end by 10-11 AM CDT.

   ..Wendt.. 04/14/2019

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

   ATTN...WFO...LOT...ILX...LSX...DVN...

   LAT...LON   40439112 41009034 41468962 41798894 41728849 41148853
               40528962 40148999 39829102 39969139 40229140 40439112 

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Page last modified: April 14, 2019
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