WATERLOO, Iowa (AP) — Authorities say minor to moderate flooding along the Cedar River in northeast Iowa could worsen if scattered thunderstorms in the forecast bring heavy rainfall. The National Weather Service said Monday that the Cedar River at Cedar Falls already was more than 3 feet (1 meter) above flood stage and wasn’t expected back below until Thursday morning. The flooding forced closure of George Wyth Memorial State Park in northwest Waterloo, and street flooding has been reported.

The Shell Rock River is causing minor flooding in Shell Rock and isn’t expected back below flood stage until Tuesday morning — a forecast that could change with any appreciable rain. The city of Greene has erected barriers keep out floodwaters. A flood warning also has been issued for the Winnebago River in Mason City.