JEFFERSON CITY, Mo. — It has been a relentless storm season in the Midwest.

First came flooded farm fields and roads across Nebraska and Iowa. Then the Mississippi River rose and rose, threatening towns along its banks. And on Wednesday night, a series of violent tornadoes tore through the region, ripping apart buildings and darkening whole neighborhoods.

Even then, another threat was looming: rising waters. In Tulsa, Okla., and surrounding suburbs it was a tense evening on Thursday as water levels steadily rose and officials braced for some of the worst flooding in decades along the Arkansas River after the Army Corps of Engineers increased the flow of releases from Keystone Dam.

And officials were warning of swollen waters along the Mississippi, the Missouri and the Illinois Rivers.

[Update: Deadly tornado strikes El Reno, suburb of Oklahoma City.]

All of it was bringing a new level of exhaustion to a region that has found itself fighting multiple crises through a wet and battering spring.