A frontal system squirming through a very warm air mass loaded with moisture sets the
stage for more thunderstorms Sunday, Sunday night and Monday. This morning the
southern edge of a strong complex of thunderstorms moving east into central Lake
Michigan will pass over northeastern Illinois. Scattered downpours and possible severe
weather may be experienced in the Chicago area, especially to the north near the
Wisconsin line. Some sailboats in the Mackinac race could get caught in the
thunderstorms over Lake Michigan and bucking easterly winds the remainder of the race
to the Straits of Mackinac. The sun should break out over the metro area later Sunday
morning. Then heating will push temperatures back to the 90-degree level, triggering a
possible redevelopment of thunderstorms.
ANOTHER SURGE OF STORMS TONIGHT AND EARLY MONDAY
One last low-pressure disturbance is expected to ripple through northern Illinois
Sunday night and early Monday, driving the frontal system south beyond the Ohio River.
Heavy downpours may occur. Later Monday, the southern portion of high pressure
centered over Canada will push into the southern Great Lakes and Midwest, bringing
milder, less humid air to Chicago.
