SPC MD 338


MD 0338 Image

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...


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

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