A huge avalanche in July stripped the north face of Mt. Belanger in Jasper National Park, Canada, down to bare glacial ice. Photo by Grant Statham
The Prescription - May 2021
KNOW THE ROPES: SUMMER AVALANCHES
Spring and Summer Hazards for Mountaineers
It’s springtime and that means snow slopes have stabilized and avalanche danger is a thing of the past, right? Not so fast. For mountaineers and skiers, avalanche season continues well into summer. And in the warmer months, mountaineers account for the large majority of fatal avalanche incidents.
For the 2020 edition of Accidents in North American Climbing, Seattle-based ski mountaineering guide and avalanche forecaster Matt Schonwald wrote an in-depth “Know the Ropes” article about mountaineering avalanches. At the top of his article, Matt described the problems with these avalanches and the reasons many climbers are less than fully prepared:
Spring avalanche on the Ptarmigan Glacier in Rocky Mountain National Park. Note the track on the left. A party of climbers/skiers climbed this slope about one hour before the slide. Photo by Dougald MacDonald
“Although a large majority of avalanche fatalities occur in the winter months, avalanches are not uncommon in the long days of late spring and early summer. According to the national database compiled by the Colorado Avalanche Information Center (CAIC), since 1951 in the United States, 39 out of 44 avalanche fatalities in June and 31 out of 43 in May have involved climbers.
“Most backcountry skiers and winter mountaineers in avalanche-prone areas have some knowledge of the hazards and carry basic avalanche safety equipment, such as transceivers, probes, and shovels…. But preparation for avalanche hazards in the spring and summer mountaineering season is not as widespread or systematic. Most avalanche training is skewed toward winter travelers, and many avalanches that affect mountaineers occur in terrain not covered by avalanche forecasts or after avalanche centers have shut down for the season.
“At the same time, the consequences of an avalanche are at least as great for mountaineers in spring and summer as they are during the winter months. As the winter snowpack melts back, additional hazards are exposed. Cliffs, narrow couloirs, exposed crevasses or boulder fields, and other terrain traps make an encounter with even a small avalanche potentially fatal.
“Mountains big and small possess the potential to bury or injure you with the right combination of unstable snow, terrain, and a trigger—often someone in your party. It’s not only important to recognize these hazards but also to have the discipline to respect the problem and choose another route or wait till the risk decreases. In preparing to enter avalanche terrain, the mountaineer must be focused more on avoiding avalanches than on surviving one, and that is the focus of this article.”
Matt’s story goes on to describe how to recognize avalanche hazards in mountaineering settings and how to plan climbs to minimize the hazards. If you’re contemplating a climbing or skiing trip in snowy mountains this season, this article is essential reading. If you prefer a PDF copy, log in to your profile at the AAC website and look under Publications in the member benefits area—you can download the complete 2020 ANAC there.
FROM THE ARCHIVE: A Real-World Example From Mt. Hood
Mt. Hood’s south side, about 24 hours after the avalanche on May 31, 1998. (A) The 300-foot crown fracture extended across the whole slope above Crater Rock, varying from one to five feet high. (B) The Hogsback bergschrund, below the Pearly Gates. Screen shot from KGW-Television cam at Timberline Lodge
In the 1999 edition of ANAC, we described a tragic incident on Mt. Hood on May 31, 1998. An avalanche struck a team attempting the West Crater Rim route at 10:05 a.m. and swept down about 1,250 feet. One climber was killed in the slide and two others seriously injured; the leader of the group, on a separate rope team, also was injured. The party had headed up the mountain despite one to two feet of new snow in the past week, a “high avalanche hazard” warning posted by the U.S. Forest Service, and signs of recent avalanche activity along their route.
According to the Mt. Hood climbing ranger, most of the people on the mountain that day in late May did not carry avalanche transceivers. “Some of these climbers later remarked that they hadn’t considered avalanches to be a problem, as it was late in the season and it was such a beautiful day,” the report says. “But in fact, a secondary maximum in monthly Northwest avalanche fatalities occurs in May, similar to the mid-winter Northwest maximums.”
Read the full ANAC report here.
Rockfall took out this anchor at the Narrows, near Redstone, Colorado, last summer. Photo by Chris Kalous (@enormocast)
IT’S SPRINGTIME! HEADS UP!
Avalanches aren’t the only hazards that trend upward in springtime: Rockfall and loose holds become more frequent at many cliffs in the spring, as the freeze-thaw cycle and heavy precipitation prepares missiles for launching.
Last May, a climber experienced this the hard way during the fifth-class approach to Break on Through at Moore’s Wall, North Carolina. Two weeks of heavy rain had loosened some big holds, and this climber found one of them. His report will be published in ANAC 2021, but you can read it now at the AAC’s publications website.
If you choose not to wear a helmet for shorter climbs, such as sport routes, consider changing this habit for spring and early summer climbs. In addition to the hazards mentioned above, thunderstorms frequently send volleys of rock over cliffs, threatening climbers and belayers alike. Rockfall also may impact fixed gear and anchors: Check before you trust.
THE SHARP END PODCAST
Last summer, Jes Scott and Erica Ellefsen set out on an 80-kilometer high-mountain traverse from Mt. Washington to Flower Ridge in Strathcona Provincial Park, British Columbia. Listen to the latest Sharp End podcast to hear what went wrong during their planned eight-day traverse and how they decided to call for a rescue. The Sharp End podcast is sponsored by the American Alpine Club.
The monthly Accidents Bulletin is supported by adidas Outdoor and the members of the American Alpine Club.