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Starting on Thursday afternoon, a significant rainfall event should begin to unfold across the upper Midwest. Late-week and weekend rainfall, which will include heavy showers and locally severe thunderstorms, could reach 3 to 5 inches or more in the upper Mississippi Valley and the upper Great Lakes region. Meanwhile, a wave crossing the Caribbean Sea is expected to develop into a tropical cyclone during the next several days. Regardless of development, heavy showers should begin to overspread the U.S.

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