Individuals planning to travel or spend time outdoors Sunday, almost any direction from Chicago, should closely monitor weather observations/forecasts. With a warm front approaching from the south, the Chicago area could experience a several hour period of freezing rain and resulting treacherous travel Sunday afternoon into the early evening. Temperatures will start out in the 20s and rise slowly during the day-- probably reaching the upper 20s in the early afternoon, about the time some light freezing rain, possibly mixed with sleet could begin to fall especially just to the west and south of the city. As the afternoon goes on, freezing rain is expected to spread across the area into southern Wisconsin, northwestern Indiana and out over the lake into Lower Michigan with temperatures continuing to slowly rise. By Sunday evening readings here should be in the low to mid 30s with the freezing rain changing over to a cold rain or drizzle.
50-degree high Tuesday
The warm front is forecast to surge north into Wisconsin Sunday night, followed by mild southerly flow. A cold front will be approaching from the northwest Monday night, and a tightening pressure gradient should produce strong gusty southwest winds that will boost temperatures into the 50s early Tuesday morning. Showers and thunderstorms could produce damaging winds, vivid lightning and brief heavy downpours prior to the cold frontal passage. Temperatures will be falling on the wings of strong northwest winds Tuesday afternoon and night. As Arctic high pressure builds into the Midwest and Great Lakes, temperatures will continue to fall Wednesday. Cold high pressure will hold through the remainder of the workweek with northwest flow producing significant lake effect snow showers in the northern Indiana and southwest Lower Michigan snow belt.