Trip Planning for Northern Madison

From obs.: "Saw a recent cornice triggered wind slab off of Hardscrabble Peak, crown looked fairly fresh. There was a second crown line below the rock band. Conditions were very windy, with snow still being transported. Most snow surfaces were wind affected, but saw no cracking or collapsing." Photo: F. Miller

Cracking in the new and wind-drifted snow on the Ridge of Middle Basin. These resulted in a narrow avalanche that ran quite far. 

Photo: GNFAC

Buck Ridge, snowmobile triggered avalanche. Propagated in the storm slab. Photo: C Erhard

Swift Current lift shut down all day Wednesday 2/5/25 by ski patrol

On the headwall of the Second Yellow Mule, we saw two recent wind slab avalanches. These were small (R1 D1), immediately below the ridge, and likely broke late last night or this morning. Photo: GNFAC

On the headwall of the Second Yellow Mule, we saw two recent wind slab avalanches. These were small (R1 D1), immediately below the ridge, and likely broke late last night or this morning. Photo: GNFAC

Strong winds blew all day from the SW, sustaining 30mph at ridgelines. Snow was actively transported all day by winds, and plumes were visible on far away ridgelines and summits. Photo: GNFAC

This slab from my ski cut was about 20” deep and 60’ wide. It’s NE facing so pretty wind blown. Photo: S Budac

Cracking and isolated pockets of wind slab in Beehive. 

Human triggered release of cornice overhang near the weather station on Buck Ridge. Recent activity next to the small release. Crown 1-2’ deep, 40’ run, 75’ across running over the tracks riding underneath in the recent wind transported slab.

We also spotted a small, snowmobile triggered avalanche on a steep, east facing slope in Muddy Creek.  Photo: USFS Snow Rangers 

Saw this cool illustration of wind deposition, scouring and unaffected snow on a ridge line near the top of Bear Creek at the far end of Buck Ridge. Photo: USFS Snow Rangers 

Photo: M R

The surface evolved throughout the day, so we must continue tracking its progression. We found surface hoar in the valley of Beehive, where inverted temperatures were the coldest, crusts with near-surface facets below, and some straight near-surface facet—recycled powder, along with thicker crust and wet snow. Photo: GNFAC

The surface evolved throughout the day, so we must continue tracking its progression. We found surface hoar in the valley of Beehive, where inverted temperatures were the coldest, crusts with near-surface facets below, and some straight near-surface facet—recycled powder, along with thicker crust and wet snow. Photo: GNFAC

Recent avalanches noted on the NE-E aprons on cedar mountain. SS-N-R2-3-D2-I These appeared to have possibly happened during the last storm cycle and looked to be isolated to layers within the new old snow interface. I also noted similar activity on the same aspects on the adjacent ridge during our approach.  

Recent avalanches noted on the NE-E aprons on cedar mountain. SS-N-R2-3-D2-I These appeared to have possibly happened during the last storm cycle and looked to be isolated to layers within the new old snow interface. I also noted similar activity on the same aspects on the adjacent ridge during our approach.  

Jan 24, Buck Ridge... We dug on an E facing slope at 9,400'. Snow depth was 155cm (5 feet) and we had an ECTN12 on the surface hoar layer 10" down. Photo GNFAC

Large wind transport in Spanish peaks. Photo: T Blakeway

Surface hoar was on the snow surface today. It likely wont' survive to be buried. Sunshine on south aspects was already destroying it.

Snowpit and ECT result from small slope just above Beehive Creek at 8200 ft. 

Facets in thinner snowpack areas are larger, weaker, and could possibly cause an avalnache

Snowpit from the top of Tyler's slope in Beehive Basin, W facing, 9200 ft. This is representative of an area with thin snow that is weaker

On Tuesday, January 19, 2016, a Yellowstone Club (YC) Ski Patroller triggered an avalanche on a wind-loaded slope which released on his second turn. The slide broke 2-4 feet deep, 300 feet wide and carried him through a terrain trap of thick trees. He was partially buried 300 vertical feet below in the toe of the debris. His partners reached him within three minutes, but the trauma was fatal.

The YCSP created a non-profit to remember their colleague and friend, Darren Johnson. And, to support ski patrollers across the country by providing scholarships for avalanche education and attendance at the National Avalanche School. 

The Yellowstone Club Ski Patrol noted multiple large avalanches on different bowls and aspects of Cedar Mountain at approximately 9400 feet elevation. Photo: YCSP

The Yellowstone Club Ski Patrol noted multiple large avalanches on different bowls and aspects of Cedar Mountain at approximately 9400 feet elevation. Photo: YCSP

From IG 1/3: “Buck ridge today. NE aspect. Probably 100’ wide and at least 3’ deep. Looked like it was triggered by a snowmobiler earlier in the day.” Photo: P Rockwell

From IG 1/3: “Buck ridge today. NE aspect. Probably 100’ wide and at least 3’ deep. Looked like it was triggered by a snowmobiler earlier in the day.” Photo: P Rockwell

Triggered slide in Beaver Creek 1 Jan 2024

Found a bigger pocket that had pulled out on steeper terrain in the 1st Yellow Mule no tracks around since we were the first in there. Photo: Anonymous 

Found a bigger pocket that had pulled out on steeper terrain in the 1st Yellow Mule no tracks around since we were the first in there. Photo: Anonymous 

Noticed a small 8-10” wind slab pocket on the way in, looked like storm load but could have been sled triggered from the top. Photo: Anonymous 

Noticed a small 8-10” wind slab pocket on the way in, looked like storm load but could have been sled triggered from the top. Photo: Anonymous 

Small avalanche NE aspect near top of beaver. D1 natural trigger wind slab. Only observed avalanche from groomer trail. Photo: Z Bailey

It only took 20 minutes of skinning before we triggered a small avalanche in a terrain trap from a flat bench above. This slide (R3 D1) broke 150' wide, about a foot deep, and filled the creek bed below. Photo: GNFAC

It only took 20 minutes of skinning before we triggered a small avalanche in a terrain trap from a flat bench above. This slide (R3 D1) broke 150' wide, about a foot deep, and filled the creek bed below. Photo: GNFAC

It only took 20 minutes of skinning before we triggered a small avalanche in a terrain trap from a flat bench above. This slide (R3 D1) broke 150' wide, about a foot deep, and filled the creek bed below. Photo: GNFAC

Small slide in terrain trap. Looks to be old, likely from before the wind event that occurred mid last week. A snowmobile track leads into it with wind-drifted snow covering the track. Photo: L Welles