Overview
- Meteorologists report the pattern change is underway and models show the most widespread heavy rain and embedded stronger storms arriving Friday into Saturday across large parts of the country.
- The National Weather Service has issued warnings for potential torrential downpours and localized flooding for areas south of I‑80 in the Chicago region as multiple rounds of rain move through.
- Parts of Montana and the northern Plains are forecast to see unusually high mid‑September moisture, raising the risk of heavy, long‑lasting rainfall and localized flood impacts over the weekend.
- South Florida faces daily rain chances near 70–80 percent with slow‑moving storms that can drop intense rainfall over the same spots, while southeast Texas has abundant tropical moisture but a strong inversion that is likely to cap storm growth and limit coverage to roughly 40 percent.
- Forecasters say the multi‑day wet spell should taper from west to east late Sunday into Monday, with high pressure and drier air expected to build back into many areas by mid‑next week.