A tornado injured at least five people and damaged buildings in eastern Colorado on Saturday, according to authorities, and more storms were anticipated in the Plains.
The Yuma County Sheriff's Office said its deputies would be assessing the damage and coordinating with first responders after the half-mile-wide twister touched down at the north edge of the city of Wray.
Four structures suffered "significant" damage and five people suffered minor injuries, according to the sheriff's office. It added that the storm knocked down about 40 electric poles.
Several other tornadoes were reported in the area of Wray, a town of about 2,300 about 12 miles from the Nebraska border.
The largest tornado followed U.S. 385 north of the town, throwing down power lines and strewing debris across the highway.
Elsewhere in the state, a "multi-vortex tornado" was reported over Interstate 76 near the town of Wiggins. At least a dozen trailers were overturned, NBC station KUSA of Denver reported.
Another tornado reportedly touched down and caused damage to several structures west of Wiggins in Weld County. The Weld County Sheriff's Office said no one was injured.
As authorities continued to assess the damage, forecasters warned of severe thunderstorms forecast for the Plains on Mother's Day.
More than a million people in Kansas and Oklahoma faced the threat of severe storms, which were expected to deliver large hail and possible tornadoes in the late afternoon, according to the National Weather Service.
Central and western Texas were also gearing up for heavy winds and storms Sunday that would likely continue to pound the area — along with parts of Missouri, Nebraska, Kansas Arkansas and Louisiana — through Monday, according to The Weather Channel.
Thunderstorms were expected over Kansas, Oklahoma and central and west Texas on Sunday, with the potential for tornadoes and hail that could cause damage.