A slowly advancing storm system is releasing up to eight inches of rain on the Southern Plains over a span of 12 hours, leading to flash flood emergencies in Oklahoma, Kansas, Missouri, and Arkansas. The National Weather Service Weather Prediction Center has issued a Slight Risk of Excessive Rainfall for the area overnight on Wednesday, with meteorologists alerting that conditions are expected to deteriorate by Thursday morning. Rivers in eastern Oklahoma and western Arkansas are already experiencing flooding. The Arkansas River is under close observation due to the risk of levee overtopping.