<pre>ACUS11 KWNS 190059 SWOMCD
Mesoscale Discussion 0023 NWS Storm Prediction Center Norman OK 0658 PM CST Fri Jan 18 2019
Areas affected…Southeast MN…Northeast IA…Southern WI…Far Northern IL
Concerning…Heavy snow
Valid 190058Z – 190700Z
SUMMARY…Moderate to locally heavy snow rates will be possible this evening, with a decreasing trend expected from west to east with time.
DISCUSSION…The persistent heavy snow band across portions of southern MN and far northeast IA has begun exhibiting a weakening trend in the last 1-2 hours. The midlevel frontogenesis that sustained this band across southern MN should continue to weaken this evening, as a northern stream shortwave trough moving across the Dakotas continues moving southeastward as it deamplifies. Meanwhile, low-to-midlevel frontogenesis may become refocused to some extent further southeast from far northeast IA into southern WI and northern IL later this evening, in response to the deepening cyclone moving across the southern Plains. Moderate ascent through the dendritic growth layer will support relatively efficient snow production, with moderate to locally heavy snow rates remaining possible through the evening.
Snowfall should begin spreading into northeast IL (including the Chicagoland area) after 03Z, while snow rates further west across northeast IA and southern MN should substantially diminish by this time.
..Dean.. 01/19/2019
…Please see www.spc.noaa.gov for graphic product…
ATTN…WFO…LOT…MKX…DVN…ARX…MPX…DMX…
LAT…LON 42619090 42859214 43209305 43629368 43899333 44029231
43559020 43018849 42738806 42688788 41848770 41548836 42258995 42619090 </pre>
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