Sheridan County has been under a flood warning since 12:17 p.m. Tuesday and, as of 9:15 p.m., the National Weather Service in Billings doesn't expect to lift that warning until 12:30 p.m. Wednesday.

The weather service credits rainfall of two to four inches throughout the day and increased runoff from snow melt.

Impacted areas include Sheridan, Ranchester, Dayton, Big Horn, Clearmont, Banner, Story and Ucross.

A weather service map lists the Tongue River, Big Goose and Little Goose creeks as flooding. All of those drain the nearby Bighorn Mountains.

Motorists are reminded to "turn around, don't drown" if they encounter flooded roadways.

"A mere 6 inches of fast-moving flood water can knock over an adult," the weather service warns in a PSA. "It takes just 12 inches of rushing water to carry away most cars and just 2 feet of rushing water can carry away SUVs and trucks."

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