"Mother Nature is not cooperating."
That was the message Sunday from frustrated authorities battling even more bad weather in flood-hit Colorado.
Heavy clouds and rain grounded helicopters, slowing the search for the nearly 500 people who remain unaccounted for. Authorities fear as many as six may be dead.
"Mother Nature is not cooperating with us today, and currently we are not flying. But tomorrow if we get that window of opportunity, which is sounds like we might get, we have the horsepower to hit it hard," incident commander Shane Del Grosso told reporters.
Up to 1,000 people are waiting to be evacuated, he said.
In the meantime, authorities are looking for opportunities to get in by ground and planning their next steps.
But they are waiting for their break.
"We need a change in the weather pattern ... to really go after what needs to be done out there," Del Grosso said.
'A river outside our door'
All things considered, Tim Ferenc and Kerry Cerelli consider themselves lucky.
The Boulder couple woke up early one morning last week to a rushing river.
"We heard what sounded like strong wind or a river outside our door," she said. Video he shot showed water running right around their house.
In case they couldn't later, they decided to evacuate.
"It's funny the things you think are important. In that moment, it was our dog, I grabbed my birth certificate, and a couple of our stuffed animals from our childhood, and that was the only thing that seemed important at the moment -- just us and a couple of sweet things," said Cerelli.
The outside of their home is a mess, but the structure itself is in pretty good shape, Ferenc said.
Others weren't so lucky.
According to the Colorado Office of Emergency Management, the floods have destroyed 1,502 residential structures and damaged 17,494.
They have also been blamed for as many as six deaths, counting two people presumed to have been killed.
The four confirmed deaths include a man and a woman, both 19, who were swept away after leaving their car Thursday in Boulder County. Authorities said the woman left the car first, and the man jumped out to try to save her.
Another body was found in a collapsed home in Jamestown in the same county. Rescuers recovered a fourth body on a roadway in Colorado Springs in El Paso County.
Those presumed dead include a 60-year-old woman and an 80-year-old woman, both in Larimer County.
Witnesses saw the younger woman swept away by floodwater that demolished her house. The older woman suffered injuries and was unable to leave her home.
An additional 482 people remained unaccounted for in Larimer County and 318 in Boulder County. Authorities believe most or all of those people are safe but simply out of touch with relatives or officers who found their homes empty.
"They are taking this stuff back'
Despite the devastation, Larimer County Sheriff Justin Smith told reporters Sunday that some of what he's seen has restored his hope.