- Unsafe storms that triggered flash floods and more than two dozen reports of tornadoes are moving east through Arkansas, Missouri and IL.
More severe thunderstorms are expected on Tuesday evening, with the Storm Prediction Center warning that the threat is greatest over Missouri and northern Arkansas.
"The good news is that the whole system is not as extreme as originally feared and it is weakening as it moves east through the day, but flooding is still the big concern", Otto said.
The underpass on north Grand is closed due to high water.
Storms will continue throughout the night, and tornadoes are expected to touch down in parts Oklahoma and Texas.
"A flood watch remains in effect until Tuesday afternoon".
At one point there were almost 50 reports of tornadoes in just 24 hours.
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In early May, the MS broke its July 9, 1993, record after heavy rainfall triggered flooding from Minnesota to the Gulf of Mexico, CNN affiliate WQAD reported.
Water rescues were reported overnight into the early morning hours.
Outside of the high risk area, much of the southern Plains into northern Texas could experience severe storms and a tornado threat.
The heavy rain associated with this storm system meant a threat of flooding across nearly the entire state of Missouri, which extended east into western IL and north into southeast Iowa, where flood watches were in effect.
NWS officials are asking anyone who observed any weather-related damage to report it to the National Weather Service via Severe Weather Reporting methods or by calling 937-383-0031. Flooding spread from the north and west sides of Oklahoma City northeast to Tulsa, where four to eight inches of rain fell in a short time.
School districts across Oklahoma have cancelled classes on Monday in anticipation of the storm.
Oklahoma Gov. Kevin Stitt said in a statement that the state emergency operations centre was activated and urged motorists not to drive around barricades or into flooded roadways.
National Weather Service meteorologist John Pike said a layer of relatively warm air aloft developed late on Monday afternoon over central Oklahoma and capped the development of thunderstorms.