The National Weather Service said the storm dropped up to an inch of rain in parts of Platte and Clay counties in less than an hour.
The dry weather has damaged crops and livestock across Missouri, and the governor's request is the first step in declaring the parched areas as disaster areas.
Gov. Jack Dalrymple said an agreement among states would not only help with flood management, but also with balancing the competing interests of upstream and downstream states.
This has been the hottest summer since 1980, and the lack of rainfall combined with a seemingly relentless streak of hot days in July has created a challenge for farmers.
Columbia's excessive heat warning is set to expire Wednesday at 7 p.m.
The state will pick up 10 percent of the cost of the expedited debris removal program not covered by the Federal Emergency Management Agency.
A thunderstorm that formed west of Boone County resulted in damage at the Boone County Fairgrounds and in a few places around the county.
Two men and a woman have been found dead in their homes, and the county health department considers them probable heat-related deaths.
Missouri's governor has asked President Barack Obama to issue a major disaster declaration for 23 northern counties hit by severe storms and flooding along the Missouri River.
The warning will remain in effect until 7 p.m. Thursday. Heat index values are expected to be as high at 101 on Monday and Tuesday.
The tornado that struck on May 25 scattered personal effects across parts of the city; the Salvation Army office has three boxes of items yet to be claimed.
For two days before May 22, the Storm Prediction Center in Norman, Okla., suggested there was a 30 percent chance of severe thunderstorms that day.
Warnings about excessive heat stretched from Kansas to Maine and the Carolinas. Temperatures were forecast near or into the triple digits Friday.
To escape the heat, here's a list of five ways to stay cool Friday night.
Hot weather that has plagued the Plains for days spread eastward Thursday, putting residents of several more states under a sizzling sun and excessive heat warnings.
A dome of high pressure, extraordinary in scope and duration, is causing record-setting heat from North Dakota to Texas.
Children and adults both look for ways to get through another hot day.
People around the nation are looking for relief from oppressive heat.
As the Midwest simmers in an extended heat wave, people need to keep an eye on their animals, the Humane Society advises. Dogs and horses are at greatest risk of dehydration.
Occupancy at Harbor House has risen from 55 percent to 80 percent over the last couple of weeks, during a heat wave called "life threatening" for the homeless.