Heavy downpours, severe storms and a flash flood threat are looming over parts of the Upper Midwest and Great Lakes heading into the work week ahead, including several major cities from Chicago to Pittsburgh.
A surge of moisture from the Gulf is streaming north, and will collide with a developing low-pressure system on Sunday, sparking severe thunderstorms across the Midwest, according to the FOX Forecast Center.
Large-scale organized thunderstorms are expected to form and sweep through northern Illinois, eastern Iowa and southern Wisconsin, bringing severe weather and a significant flash flood threat, especially to urban areas.
A secondary line of storms is expected to sweep through southern Wisconsin and northern Illinois later Sunday evening.
A level 2 out of 5 severe storm threat is in effect on Sunday for parts of the Midwest, including northern Illinois, eastern Iowa and western Indiana.
This threat zone includes Chicago, where damaging winds and a possible tornado are among the main concerns.
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Severe storms remain likely on Monday, as a slow-moving cold front driven by abundant moisture and instability moves into the Midwest and southern Great Lakes.
Monday's level 2 of 5 severe storm threat shifts east slightly, and covers major cities, including Chicago, Detroit, Cleveland and Pittsburgh.
Again, damaging winds will be the primary hazard with the storms on Monday. However, storms that track over the same area over and over again also pose a flash flood threat.
As we move into Tuesday, the front will continue its trek to the East, renewing chances for heavy showers and thunderstorms across the Midwest and Ohio Valley.
Widespread rain totals of 2 to 3 inches are expected from Chicago to Cleveland, with localized pockets of 3 to 5 inches of rain possible in northern Indiana and Ohio where those repeat showers occur.
A 2 out of 4 flash flood threat is in place along the southern Great Lakes starting Sunday and continuing through Wednesday, according to the FOX Forecast Center.
Additionally, rain will likely continue into Thursday, with localized rainfall totals across West Virginia potentially exceeding half a foot by the end of the week.
Stick with FOX Weather as we continue to track the storms and give you the latest forecast and information.
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