Three skiers have been confirmed dead from Tuesday's avalanche at the Silver Mountain Resort near Kellogg, Idaho, and four people were rescued and survived. The others were identified by the sheriff's office on Thursday as Carl Humphreys, 58, of Liberty Lake, Washington, and Scott Parsons, 46, of Spokane Valley, Washington.

After Humphreys and Parsons were found, the resort said it didn't realize that another skier was missing until a day after the avalanche, when it received a call Wednesday morning from a concerned family member unable to get in touch with that person, who turned out to be Hubbard.

That prompted searchers to resume their hunt on Wednesday and Thursday.

The avalanche came after the ski resort in the Idaho Panhandle received heavy snow and resort crews used explosives the morning of the slide to try to reduce avalanche threats on Wardner Peak, where all of the runs are rated as difficult.

University of Minnesota Department of Neurosurgery acknowledged Hubbard's death Friday, saying she'd graduated from its residency program last year and was working on a pediatric neurosurgery fellowship in Seattle.

"Her love of life, her jokes, her optimism, and her contributions to the practice of neurosurgery will be sorely missed," the department said in a Facebook post.

The Idaho Panhandle Avalanche Center is investigating the cause of the avalanche, the resort said.

During the winter of 2018-19, 25 people died in avalanches in the United States, The Spokesman-Review newspaper reported.