NEAR VERLOT, Wash. -- Rescuers have airlifted the last two of the three teens who were stranded on a mountain overnight, officials told KIRO 7 Eyewitness News.

The first boy, 17-year old Steven Bette, walked down the mountain with the help of volunteers Wednesday afternoon.

The second boy, 16-year-old Van McKeon, was the first to be airlifted down to Granite Falls, where a sheriff's helicopter was using the parking lot of an elementary school as a landing zone, Wednesday evening when the weather finally cleared. McKeon was reported to be in the worst condition and suffering from hypothermia.

The remaining boy, 17-year-old Shane Helm was starting to walk down with volunteers when the weather cleared and he was told a chopper would be taking him down instead. He was flown off the mountain around 7 p.m. Wednesday.

Helm and McKeon, who are brothers, admitted they were unprepared when they began hiking toward the Three Fingers lookout tower with their friend Bette.

Crews brought portable shelters to keep the two remaining teens warm, until they could be airlifted or brought down the 7-mile trail from Three Fingers Mountain in Snohomish County.

Both were suffering from mild hypothermia.

Members of the search and rescue team found the three Wednesday morning. They were cold and wet from an overnight stay at about the 6,200-foot level on the mountain in the Cascades northeast of Everett.

"We are just so happy," said Cherie Williams, the grandmother of one of the boys. "They had a hard time finding them because of the fog and the rain. It's miserable up here."

The three were on a hike Tuesday and planned to spend the night in a shelter at the summit when they were caught off-guard by bad weather, pinned down by fog, snow, rain and cold.

Two experienced hikers told KIRO reporter Chris Legeros they advised the teens not to go up the mountain.

Hikers Mark Anthony and Gus Gustavson said they spotted the three teens while they were hiking that day.

"They were seemingly inexperienced and not sure where they were at. We advised them that they shouldn't go and they kept on going," said Gustavson.

Gustavson and Anthony, who showed Legeros photos of the terrain in the area, said the climb is steep and through rough terrain that includes slippery fields of snow and ice.

As Anthony and Gustavson started down the mountain, they said they saw the teens again and offered another warning.

"I just yelled up that the next part was incredibly difficult and I'm not sure exactly what he said but he didn't seem happy to get that information," said Anthony.

The sheriff's office said the three called 911 Tuesday night, saying they were soaked and that they did not have a dry change of clothes.

A team of search and rescue climbers hiked up the mountain late Tuesday night in darkness, in hopes of getting to the three by daylight, when rescuers hoped to have a helicopter rescue them off the mountain. Bad weather Wednesday morning prevented a helicopter from getting to the area until early evening.

"They used tarps and they used portable stoves and heaters to give the boys a spot to go into and get warm, bring their body temperature back up where it needs to be," said Rebecca Hover of the Snohomish County Sheriff's Office.