South winds gusting over 40 mph on Saturday, swept mild air across much of the Midwest. High temperatures reached 70 degrees for the first time this year at both Midway airport, and O’Hare International Airport. Cold air retreated to the upper Midwest, where temperatures hovered in the low 30s. Snow accumulated 8 to 10 inches from northern Minnesota to Michigan’s Upper Peninsula.
The arrival of spring-like temperatures may also bring the area its first thunderstorms. An influx of mild air on Monday is expected to combine with an increase in the moisture content of the air. This is forecast to provide fuel for thunderstorm development. Periodic thunderstorms may persist through mid week as a frontal boundary stalls across the Midwest. This front is expected to be the focus for wild temperature fluctuations and heavy rainfall.