A taste of spring, then back to winter

As successive low pressure systems track east across Lake Superior through northern Lower Michigan later this weekend, strong westerly winds tug on warm air in the plains pulling it into the Midwest. High temps will reach well into the 60s just to the west and south Sunday, while the Chicago metro area flirts with 50° highs. Under the influence of gusting SW winds, temps will hold in the 40s Sunday night and might even reach 50 again Monday despite a heavy cloud cover and liklihood of rain. Later Monday temperatures will fall into the 30s, never to see 40° levels the remainder of the week. By Tuesday, upper level Jet stream winds will take a position that may be relatively unchanged for the following 10 to 14 days—with northwest flow over the northern Plains directing the southern portion of the coldest Canadian air directly into the western Great Lakes. Starting Tuesday for the remainder of the week, daytime highs will average in the late-January-like lower 30s.