12:30pm Update: The precipitation is having a hard time making much progress north late this morning, however, we could still see a few light bands of light rain/flurries into the afternoon as the dew points continue to rise. In fact, there are a few bands beginning to show up across northern Illinois. These will continue to lift north into southern Wisconsin. Look for light rain mixed with snow/sleet into the afternoon. Coverage may increase into tonight.
A developing low pressure system in Oklahoma will continue to move northeast into Missouri, southern Illinois and eventually into Ohio by Wednesday afternoon. High pressure over the upper Midwest earlier this morning was keeping a good amount of dry air flowing in the mid levels of the atmosphere. The high pressure will eventually move east and this will allow some moisture to move northward into the late afternoon and evening as the low lifts into southern Illinois. The leading edge of the precipitation was right along the Missouri/Iowa border extending east through Peoria and east-central Illinois. Along the leading edge a mix of drizzle, light rain and very light freezing drizzle (especially along the Missouri/Iowa border) were noted on surface observations. That's because temperatures were close to freezing but dew points also remained below 32°. As dew points rise today, especially south of Rockford, the atmospheric column above us will become saturated enough to possibly see a change over to light rain while mixed precipitation may be found closer to the Wisconsin/Illinois border. Precipitation amounts will remain very light this evening so accumulations are not expected to be much. The low will move to our southeast tonight with drizzle and fog possible. Surface temperatures overnight may dip just below freezing and that could cause light freezing drizzle, or maybe a rain/snow mix into Wednesday morning which could cause a few slick spots during your morning commute.
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