The cool and rather moist air that has bathed the Chicago area in recent days is forecast to yield, albeit slowly, to moderately higher temperatures in the days ahead as the national weather regime shifts gears. For several days, the West has been warm, even hot, and the East has been cool and wet.
That's about to change, and the transition will take place this weekend. Milder air
begins filtering across the Chicago area this weekend, and by Monday the warming
trend is expected to carry temperatures into the 70s.
But there's a complication: Mild air arrives on the wings of brisk southeast winds,
raising the possibility of lake-induced cooling in Chicago's North Shore.
FROST ADVISORIES IN UPPER MIDWEST
National Weather Service offices have posted frost advisories across portions of
Minnesota and Wisconsin for the early-morning hours Friday. Patchy frost is in the
cards again early Saturday morning for much of the Upper Midwest, including northern
Illinois and the typically colder outlying areas of metropolitan Chicago.
--By Richard Koeneman, WGN Weather Center Meteorologist
