The Fin Avalanche Accident
The Fin Avalanche Accident 3 skiers caught and partially buried, 1 seriously injured Cooke City, MT Custer-Gallatin National Forest – January 8th, 2021 SYNOPSIS On January 8, 2021 a group of six skiers triggered an avalanche on The Fin on Republic Mountain outside of Cooke City
HUMAN FACTORS IN AVALANCHE ACCIDENTS Dale Atkins
This accident and others during the 1990s highlight a troubling trend where knowledgeabl (avalanche aware) people made decisions that ended in a negative outcome In fact this accident shares many common themes (steep slopes, fresh snow, signs of instability, no rescue gear, etc ) with other avalanche accidents Every yearthese same themes reoccur
THE SME AVALANCHE TRAGEDY OF JANUARY 20, 2003: A SUMMARY OF
2 3 The Avalanche At about 10:45 am according to mountain guide and avalanche instructor Larry Stanier in his technical report to the Coroner, the seven ski tourers who were above the La Traviata couloir heard a sudden “whumpf” and noticed a shift of the snowpack Then a slab avalanche estimated to be about 50 m wide, 400 m long, and 50 cm
Bear Point Avalanche Accident *PRELIMINARY ACCIDENT REPORT*
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Bell Lake Avalanche Fatality
prior to the accident reached high 20s F with overnight lows in the teens F Temperature at the time of the avalanche was 28 F at Albro Lake and 29 F at Lower Twin SNOWPACK The avalanche occurred at 9,000’ elevation on an east-southeast aspect with a starting zone slope angle of 36-40 degrees (measured with inclinometer)
Heuristic Traps in Recreati onal Avalanche Accidents
As sad as this accident was, the real tragedy is that similar stories unfold in accident after accident, year after year An experienced party, often with avalanche training, makes a crucial decision to descend, cross, or highmark a slope they believe is safe And then they trigger an avalanche that buries one or more of them
Accidents and economic damage due to snow avalanches and
of a person in an avalanche or landslide accident is included in the economic loss as 100 million IKR (1 2 million USD) per fatal accident, the total cost of avalanche and landslide accidents in Iceland in the last 26 years together with the cost of avalanche protection measures is more than 13 billion IKR (162 million USD)
AVALANCHE ACCIDENT- Boardman Pass SUMMARY: 1 snowmobiler
the entire season A widespread natural avalanche cycle had occurred in much of the advisory area the weekend prior to the accident, and a smaller avalanche had claimed the life of a skier a week earlier; the local and regional press had covered that accident extensively On the morning of January 28th, the
Evidence of heuristic traps in recreational avalanche accidents
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AVALANCHE ACCIDENT- Boardman Pass
SUBMITTED BY: Sawtooth National Forest Avalanche CenterLOCATION: 15 Miles northwest of Fairfield, ID
DATE: January 28, 2010
SUMMARY: 1 snowmobiler caught, buried and killed
SYNOPSIS:
On January 28, 2010, a group of five backcountry snowmobilers were riding near Boardman Pass in theSoldier Mountains of southern Idaho. This area is approximately 15 miles northwest of Fairfield, Idaho
and is often accessed from the popular Chimney Creek trailhead. Two riders were climbing the west side
of Pt. 9538 when a slide started above the uppermost rider. A third rider watched as moving snow overtook the first rider and the second rider turned left and out of the slide. The slidecarried the victim over a thousand vertical feet downhill and buried him four to five feet deep next to his
snowmachine; the debris continued several hundred vertical feet further downhill. The party quickly regrouped, located the burial site with a beacon and dug deep enough to provide an airway within an estimated 25 minutes. CPR was unsuccessful. The SS-AMu-D3-R2 avalanche was 2 to 3 feet deep,approximately 300ft wide and ran over 1300 vertical feet. Prior to the accident, the Soldier Mountains had
nt and roughly three feet of snow since January 12. Moderate to strong southerly and westerly winds had accompanied the snowfall, with wind speeds peaking five daysbefore the accident. The mid-January snowfall fell on an unusually weak layer that had been a concern
the entire season. A widespread natural avalanche cycle had occurred in much of the advisory area the
weekend prior to the accident, and a smaller avalanche had claimed the life of a skier a week earlier; the
local and regional press had covered that accident extensively. On the morning of January 28th, the Sawtooth National Forest Avalanche Center (SNFAC) had identified the avalanche danger as Considerable because of the recent loading on the persistent early season weak layer.advisory urged extra caution on steep rocky slopes due to the persistent weak layer buried at the base of
the snowpack, recommended that people avoid travel on slopes steeper than 30 degrees, and expressed concern about the sunny, warm conditions forecast for the day.The coordinates for the accident:
N 43° 2943
W 114° 581
AVALANCHE:
The avalanche occurred roughly 200 vertical feet below Pt. 9497T on the broad, south shoulder of Pt.9538T. The slab broke out at the top of an open, slightly concave slope below sparse trees and snags; a
distinct trimline on the right marks this slope as an obvious avalanche path. It was classified as a SS-AMu-D3-R2. It released on a west-northwest facing slope and the relatively uniform crown was anestimated 2 to 3 feet deep. The slide propagated horizontally across the slope, and from photos appeared
to be about 300 feetextended from the trimline below towards the ridgeline above. The slope was estimated to be between 35
and 40 degrees. The debris was estimated to be at least 10 feet deep in the vicinity of the burial site.
These observations were made from the air and from photos and video taken by Sun Valley Heli-Ski, who
performed an aerial survey of the site the following day.WEATHER & SNOWPACK:
Weather data is taken from the Soldier Mountain Peak 2 weather station operated by Soldier Mtn SkiArea and the SNFAC, as well as the Dollarhide and Soldier Ranger Station SNOTEL stations. The first is
located 3.25 miles to the east at 9450 feet and was operational for the season on January 12. TheDollarhide SNOTEL is roughly 17 miles east-northeast at 8420 feet elevation. The Soldier Ranger Station
SNOTEL sits at 5740 feet elevation near the base of the Soldier Mountain Ski Area, roughly seven miles
east of the accident site.At the time of the accident, the snowpack in the Soldier Mountains, like that in much of the Intermountain
West, was marked by an unusually weak layer of faceted snow and depth hoar buried near the ground.This layer consisted of snow that fell during the late fall, but was then exposed to strong temperature
gradients during a 19-day dry spell that lasted until December 11th. Over the next week, a series of storms
on top of the facets and depth hoar layer. The shallow, unconsolidated snowpackmade travel in the mountains very difficult both on foot and by snowmachine, and few parties reported
making it into backcountry areas in the Soldier Mountains during this period. A three-day storm over New Years added quotesdbs_dbs18.pdfusesText_24