<pre>ACUS11 KWNS 271632
SWOMCD
Mesoscale Discussion 0459
NWS Storm Prediction Center Norman OK
1132 AM CDT Sat Apr 27 2019
Areas affected...Portions of northeast Iowa...Southern
Wisconsin...Northern Illinois
Concerning...Heavy snow
Valid 271632Z - 272230Z
SUMMARY...A potent mid-level low will bring periods of heavy snow to
areas along the Wisconsin/Illinois border. Areas receiving rain now
will transition to snow this afternoon before precipitation moves
out of the discussion area early this evening. Pockets of 1 in./hour
snowfall rates are possible.
DISCUSSION...Over the course of the last couple of hours,
precipitation across the Wisconsin/Illinois border has caused
temperatures to wet-bulb down to the low 30s from the low 40s.
Surface observations have shown rain turn to snow in southwest
Wisconsin with snow now occurring as far east as Janesville, WI.
Heavier areas of snow have also begun to shift out of northeast Iowa
into Wisconsin. The Mineral Point, WI ASOS has been reporting
moderate snowfall for the last hour. Temperatures should continue to
fall into the low 30s in the eastern portions of the discussion
area. Dual-pol radar observation from KDVN and KLOT continue to show
the rain/snow transition line within the second to third tier of
Illinois counties. As the mid-level low continues its approach from
the west, increased large-scale ascent and 850-700 mb frontogenesis
will support pockets of heavier snowfall, likely near 1 in./hour.
The heaviest snow should gradually taper off from west to east, with
eastern portions seeing heavy rates ending by about 7 PM CDT.
..Wendt.. 04/27/2019
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...LOT...MKX...DVN...ARX...
LAT...LON 42238930 42228976 42379076 42569131 42829154 43039151
43139126 43089066 42938997 42848920 42718817 42578775
42508768 42218772 42218858 42238930 </pre>
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