The National Weather Service in Pleasant Hill, Missouri, issued a Flash Flood Warning for counties in northwest and north-central Missouri Thursday morning after a string of severe storms dumped up to a foot of rain in the area, starting Wednesday night.

Video I took of what appears to be a tornado (unconfirmed) on the ground in far eastern Nodaway County, Missouri. #mowx pic.twitter.com/08fubJRMFJ — Mark Zinn (@NPNowZinn) June 28, 2017

The heaviest flooding seemed to be focused around Maryville. There were reports from the Nodaway County Sheriff's Office of cows floating across highways east of Maryville.

"There have been numerous road closures, we have heard of one water rescue, there have been reports of floating cows, floating livestock up by the Maryville area," said Scott Watson senior service hydrologist with the Kansas City National Weather Service.

Nodaway County Sheriff office reports cows floating across the highway east of Maryville. — NWS Kansas City (@NWSKansasCity) June 29, 2017

U highway in Arkoe MO is closed due to flooding, water over the road up ahead. @NicolePhilli @lnanderson pic.twitter.com/BdzM9ydiyI — Nick Kastelan (@nickkastelan) June 29, 2017

Road closures include 136 Highway east of Maryville.

Significant flooding ongoing in Nodaway County. Numerous roads closed across the county. Ongoing water rescue near Maryville. — NWS Kansas City (@NWSKansasCity) June 29, 2017

Bridge over Long Branch River on 136 Hwy near Maryville. MoDot says there is so much damage an engineer will need to inspect @41actionnews pic.twitter.com/4QPWrxy6LO — Richard Sharp (@richardFox40) June 29, 2017

Watson urged those in the area to be careful when driving and avoid driving across flooded roads.

"A lot of the deaths that occur in flooding are in vehicles," Watson said. "You want to turn around and find a different route if you come across a road that's flooded."

In some cases, he said, flooding can cause roads to crumble beneath the water leaving large holes.

More severe weather is expected to pass through the region Thursday.

Katie Bernard is KCUR's morning news intern.