This photo provided by Bruce Carlson shows water rushing through the Croton Dam on Thursday in Croton Township, Mich. (Bruce Carlson via AP)

Up to a half-inch of rain could fall tonight in the Iron Mountain area as thunderstorms are possible and a flood warning remains in effect throughout the region, the National Weather Service said.

Some storms tonight could produce hail. Temperatures are expected to fall dramatically and remain in the upper 30s Saturday. There is only a slight chance of showers Saturday but winds could gust up to 30 mph.

Sunday should be partly sunny with a high near 40, forecasters said.

A flood warning remains in effect for the Menominee, Brule, Pine and Oconto rivers due to snowmelt and potential rainfall.

NWS on Thursday issued a flood warning for the Michigamme River near Witch Lake and Republic in Marquette County. About 6 inches of water was covering portions of County Road LG northwest of M-95 on Thursday.

The Sturgeon River bridge on County Road 577 in Vulcan has been closed since Wednesday by the Dickinson County Road Commission due to flooding over the road. Motorists are asked to use County Road 573 as an alternate route until further notice.

In the Powers area, a detour onto local streets remains in place after both eastbound and westbound lanes of U.S. 2 had to be closed due to high water.

Menominee County officials declared a state of emergency Tuesday “due to sustained widespread and severe damage to public infrastructure caused by severe flooding.”

Menominee County was the only one in the Upper Peninsula that Gov. Gretchen Whitmer included Wednesday in declaring a state of emergency in 33 counties. Communities across the Lower Peninsula are dealing with severe weather-related impacts from rising water levels, flooding, straight-line winds and tornadoes.

Crews were hurriedly pumping water from a dam in Cheboygan, Michigan, this week, even removing floodgates to relieve pressure. Some residents were told to prepare a “go bag” containing important personal items, though Cheboygan County Sheriff Todd Ross said the number of people in the zone was relatively small.

“We are in crisis mode now,” Whitmer said after touring the Cheboygan Dam on Thursday.

In northern Michigan, Bellaire, population 1,000, said its wastewater treatment system was being overwhelmed, forcing the release of partially treated waste into area swamps. The village urged residents to reduce home water use.

Carl Johnson, 59, has a home on the rapidly rising Muskegon River in western Michigan. He went on Facebook to tell people that his boats were ready if someone needed help. People living in the river’s flood plain below the Croton Dam in Newaygo County were ordered to evacuate.

“It’s out of the banks everywhere. It’s really bad,” Johnson said of the river.

Bruce Carlson, who lives behind the Croton Dam, said the roar of the water was “deafening.” Consumers Energy, which owns the dam, said it was structurally sound.

In Wisconsin, Gov. Tony Evers on Wednesday declared a state of emergency for the entire state due to flooding and other severe weather, including tornadoes.

Storms Wednesday caused at least one death in Wisconsin when a man apparently was struck by lightning.

Police in Waukesha, west of Milwaukee, said the “area was experiencing heavy rainfall accompanied by significant thunder and lightning” when someone reported seeing the man on the ground Wednesday evening.

“Preliminary information indicates the individual was struck by lightning while walking through the parking lot during the storm,” police said.

Five tornadoes have been confirmed across southern and central Wisconsin, but the number could rise after surveys, said Mark Gehring, a meteorologist with the weather service in Milwaukee.

The Wisconsin River is at major flood stage in Portage, Wisconsin, and is forecast to reach or surpass the 20.7-foot record sometime this morning, meteorologist Gehring said.

“Right now, it’s at 19.9 feet, not that far off,” he said. “In Portage, there’s a large area of low-land flooding. Many roads are flooded. There’s a levee there. It’s important that the levee holds.”