Avalanche danger remains high in Colorado, thanks to several rounds of heavy snow that moved through the area in February. Three snowmobilers were partially buried by debris when they were caught in an avalanche north of Granby on Saturday.

One person was killed Saturday when a skier triggered an avalanche in Colorado, the Grand County Sheriff's Office said in a statement.

The slide happened on Gravel Mountain near Grand Lake just before 2:30 p.m. The Colorado Avalanche Information Center said that three or four people were caught in the avalanche, but were able to get out on their own or with the help of bystanders. It is believed to have been triggered by a snowmobile.

Rescuers in a county in Colorado's high country are talking about the amazing survival of a man trapped beneath an avalanche near Vail Pass for over an hour.

The victim was traveling on a terrain feature known as The Nose near Silverton, Colo., when the avalanche occurred on Thursday, officials said.

In a separate incident, four people caught in another avalanche escaped serious injury, Colorado officials say.

A snowboarder was killed in an avalanche in the mountains of southwestern Colorado on Thursday, the fourth person to die in an avalanche in the U.S. West this week after a string of winter storms.