Flood warning remains in effect for Dane County. Volunteers needed to help fill sandbags.

The National Weather Service issued a flood warning for Dane County on Saturday as road closures persisted in Madison after a rainy week.

Madison officials are calling for volunteers to help fill sandbags.

The isthmus between Lake Mendota and Lake Monona is particularly under threat for flooding. The weather service reports excessive flooding from the Yahara River, which runs through the low-lying land bridge. 

The City of Madison reported that the isthmus flooding could continue for one to two weeks. 

Damage from a week of heavy rains has topped $100 million, according to Dane County officials, with Madison, Mazomanie, Black Earth and Cross Plains hardest hit by storms that included an 11-inch deluge over two days. One person died.

Some roads in Madison’s isthmus are closed because of the flooding. The National Guard is on call for possible evacuations. 

Those willing to volunteer to fill sandbags can fill out a form online at https://jsonl.in/2BMa77T and they will be added to an email list. When an opportunity arises, they will be contacted, Madison officials said Saturday.

The American Red Cross is also seeking volunteers, and people can donate money or goods to Goodwill, Second Harvest Food Bank and St. Vincent DePaul.

Rain is forecast to continue over the weekend and into next week.

There is no flood warning for Milwaukee, but the weather service posted a hazardous weather outlook for the weekend. Residents in central and southeastern Wisconsin can expect dense fog into Sunday, with a chance of thunderstorms Sunday through Tuesday. 

The storms in Madison come just days after torrential rain hit the city, leaving one dead.