Millions of Americans faced travel disruptions and flood alerts as fierce storms slammed the Midwest Sunday night, delaying hundreds of flights.

At Denver International Airport alone, 21 flights were canceled and over 900 flights were delayed due to the harsh weather conditions, according to FlightAware .

Southwest Airlines logged 339 delays, United Airlines 244, and SkyWest 157. 4

The National Weather Service issued flood watches and warnings for parts of Kansas, Iowa, Nebraska, Missouri, Illinois, and Wisconsin, warning that after rain began Saturday, “repeated rounds of heavy rain” along with hail, damaging winds, and isolated tornadoes could continue into Monday.

The alert follows a wave of at least 24 storms that pounded the Upper Midwest on Saturday, blasting Omaha, Nebras

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