Strengthening southerly winds and abundant sunshine should allow temps to warm into
the mid-to-upper 60s Sunday afternoon. As a cold front approaches from the
northwest, clouds will spread across northern Illinois Sunday night acting as a blanket
to keep overnight temperatures mostly in the 50s. The cold front should move through
northeast Illinois Monday afternoon, preceded and accompanied by scattered brief
showers. Winds will shift to the north, and cooler air on the leading edge of a Canadian
high pressure air mass will feed into the metro area holding over the Midwest through
Wednesday.
LOW PRESSURE FORMS IN THE PLAINS
By midweek, a pocket of very cold air aloft is forecast to sweep out of western Canada
into the central Plains, creating a “cut-off low pressure system”. This slow-moving
system develops a broad area of cloudiness and showers. Showers may be mixed with
wet snow on the backside of this storm system. As the eastward-moving low center
approaches Kansas City, Mo. later Wednesday, the leading edge of the expansive cloud
pattern will spread over Chicago. Rain will begin here Thursday and persist into next
weekend.
