Emergency crews rescued about 20 people in Missouri on Friday after a building collapsed in a campground following widespread flooding and heavy rainfall in the state. The campers were on top of a building at the Bearcat Getaway campground near the Black River,

St. Louis area swift water rescue teams are headed to southern Missouri to assist in areas impacted by flash flooding.

The unaccounted for campers in Reynolds County, Missouri, “have been located and rescued,” Reynolds County Sheriff Caleb McCoy told CNN.

Torrential rain sent the Black River to a record 28.7-foot crest, flooding Missouri campgrounds and prompting dozens of rescues in Reynolds and Iron counties.

Residents and campers, along with our First Alert 4 crews, have captured powerful images as flood waters began to devastate the Lesterville area in Reynolds County, Missouri.

Father's Day will likely bring a mix of strong storms, heavy rain and flash flood threats to the St. Louis region.

As of Monday morning, 3/4 of an inch to 2 inches have fallen, with another inch or 2 expected by the end of the day, the NWS forecasts.

Several waves of heavy rain expected in the St. Louis region over the next few days, beginning Thursday afternoon and continuing through Saturday.

After Thursday's heavy rainfall, more rain is expected Friday and Saturday around St. Louis, and flash flooding remains a concern.