Saturday is St. Patrick's Day, so let's forecast for Chicago, Illinois, the location of one of the biggest St. Patrick's Day parades, and where they famously dye the Illinois River green for the occasion. The weather may be a little tricky, with light rain and/or snow early, then clearing at some point and a little breezy. The mix of early morning precipitation is complicated, and could include freezing rain. So let's predict the 24-hr precipitation amount (liquid equivalent) at Midway Airport, just because it's a little closer to downtown than O'Hare.
Question: If they get freezing rain overnight, how likely is it that there will be slippery roads by the time of the parade? What information would help to predict that?
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