President Obama has declared a major disaster in Colorado after severe storms touched off flooding, landslides and mudslides, the White House said early Sunday.

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More than 200 people are still “unaccounted for,” after what may have been the largest aerial rescue since Hurricane Katrina, according to the Boulder Daily Camera.

Approximately 1,200 people have been evacuated from Boulder County in the wake of a 100-year flood that killed three people.

Obama’s declaration makes federal aid available to supplement state and local recovery efforts in Boulder County.

That aid can include grants for temporary housing and home repairs, or low-cost loans to cover uninsured property losses.

Federal Emergency Management Agency Director Craig Fugate said Michael Hall would coordinate federal recovery operations in the affected areas.

FEMA said crews are continuing to assess damage in other areas, adding that more counties may be designated disaster areas.

More rain is expected in flood-devastated Colorado Sunday, The Denver Post reported.

“We’re still bracing. There are many, many homes that have been destroyed, and we haven’t been in them yet,” Gov. John Hickenlooper (D) said Sunday morning on CNN's "State of the Union."

“This is a heck of a storm.”

The White House said Obama called Hickenlooper Sunday for an update on the situation and to express his concern.

The White House also said Fugate will travel to Colorado Monday to ensure the federal government is closely coordinating with the state and local response.

FEMA has two Incident Management Assistance Teams and additional personnel at the Colorado emergency operations center. Three federal urban search and rescue teams are on the ground to support search and rescue operations in flooded and isolated areas, the White House said, adding that two more teams were expected in Colorado Sunday. Three other teams have been placed on alert.

— This report was originally published at 8:33 a.m. and last updated at 3:26 p.m.