A natural avalanche on Alp Rock north of Cooke City. Photo: G. Roe
Forecast link: GNFAC Avalanche Forecast for Tue Jan 23, 2024
A natural avalanche on Alp Rock north of Cooke City. Photo: G. Roe
The slopes above the last pillow pitch slid naturally. The crown extended from high up on the cliffs to lower down and across, and the cliff face. It ran a few hundred feet (~200) . A few new inches on the skin track (3-4)
In First Yellowmule, Dave was crossing a low-angle slope and remotely triggered an avalanche in steep terrain from 750' away. This avalanche was 1-2' deep, 250' wide, and ran 200' to the meadow below. The avalanche failed on a layer of buried surface hoar. At the crown, we dug a snowpit and had ECTP10 results on this layer.
Some avalanches we saw/ triggered were on wind-loaded slopes, and others were not. All steep slopes are suspect.
We rode into Buck Ridge today, 01/22, towards the Bear Creek wilderness boundary. Dangerous avalanche conditions exist. Skiers and riders should give themselves wide safety margins when traveling around avalanche terrain. Cautious route-finding and conservative decision-making are essential.
We saw multiple natural avalanches in Beaver Creek, First Yellowmule, Second Yellowmule, Third Yellowmule, and McAtee Basin. The recent avalanches were large enough to bury or injure backcountry travelers (D2) and likely happened within the last 24-48 hours.
We stopped at the crown of an avalanche in Beaver Creek and found a stiff, cohesive slab of wind-drifted snow on top of faceted snow below (ECTP 13, HS=188). The avalanche failed on the interface between the wind-loaded snow and fist hard facets below. The avalanche broke 2-3 feet deep, 100 feet wide, and ran 100 vertical feet.
Some avalanches we saw were on wind-loaded slopes, and others were not. All steep slopes are suspect.
Natural avalanche in McAtee Basin. Likely happened in the last 24-48 hours. Photo: GNFAC
We saw multiple avalanches in Second Yellowmule that happened in the last 24-48 hours. Photo: GNFAC
We saw multiple avalanches in Second Yellowmule that happened in the last 24-48 hours. Photo: GNFAC
Avalanche triggered by a snowmobiler from 750' away. This avalanche was 1-2' deep, 250' wide, and ran 200' to the meadow below. The avalanche failed on a layer of buried surface hoar. Photo: GNFAC
The crown of an avalanche that was triggered by a rider 750' away. This avalanche was 1-2' deep, 250' wide, and ran 200' to the meadow below. The avalanche failed on a layer of buried surface hoar. Photo: GNFAC
Natural avalanche in Beaver Creek. This was the most recent of the avalanches seen today and likely happened in the last 24 hours. Photo: GNFAC