Widespread flooding is in progress along the Arkansas River in parts of eastern Oklahoma and western and central Arkansas, The Weather Channel reported.
Evacuations are underway in areas across Oklahoma, Kansas, Arkansas, Missouri, Illinois, Nebraska and Iowa, Accuweather reports, with nine fatalities reported.
Several storms are expected throughout the central Plains eastward into the Midwest today (May 28), according to the National Weather Service. Flooding may also occur in the Omaha, Nebraska, area, Newsweek reports.
CBS News reports levees are being tested along the Arkansas River.
In St. Louis, the Mississippi River is forecast to reach its second-highest level in history, according to the National Weather Service office in St. Louis.
"The very wet spring pattern in the Plains and Midwest will continue through at least midweek as two low pressure systems move across the area," said AccuWeather Meteorologist Ryan Adamson.
It’s already been the wettest 12 months on record, according to the National Centers for Environmental Information.