Southern Madison

Dug a pit on divide peak on a southwest facing aspect that was about 210cm deep. ECTX, PSTX on sun crust 15cm down from surface that the new snow had fallen on. Entire snowpack 4F-1F from the thin sun crust to the buried facet layer than began around 165cm deep. Saw evidence of some wind slabs beginning to form near the ridge line. It was cold. 

We rode under the full length of Skyline ridge under all the south facing slide paths. 

The only avalanches we spotted were from 1-2 weeks ago. No cracking or collapsing observed.

Snowpack

• Depths ranged from about 1m to 1.5 m. The snow really got shallow as we rode west and down the cabin creek drainage. Above 8800ft and closer to the Teepee/Cabin divide, coverage was great.
• The layer of facets from early December is much weaker where the snow is less than 1 m deep and gaining strength where the snow is around 1.5m deep. 
• Conditions didn't seem dangerous. Remotely triggering a slide seems very unlikely. The odds of triggering a slide on those facets seems pretty low but still something that could happen. 
• What mainly felt dangerous is letting your guard down. With tracks everywhere, sunshine, great traction, and supportable snow, we felt that it would be easy to be complacent. If an avalanche happened, then we'd be unprepared.
• The odds of triggering a persistent slab avalanche will continue to step down unless there is another loading event (ie - more wind and snow).

Moving foward

• The danger and avalanche conditions will be dependent on weather. A small amount of snow and very cold weather is expected in the next 5 or so days
• Wind could still form more wind slabs
• The inch or two or three of snow that could come Fri/Sat will be subjected to bitter cold weather and could create a new faceted layer...time will tell
• Continue to maintain safe travel practices: exposing only one person at a time to avalanche terrain, having everyone else watch from a safe location, ensuring everyone has rescue gear and knows how to use it.

Overall impression - The snowpack in this area probably isn't as stable or strong as it is in the Northern Madison Range closer to Big Sky. The snowpack is probably stronger and more stable than on Lionhead. 

Natural avalanche spotted from the air on Red Mountain, just west of Ernest Miller Ridge

This avalanche was spotted from the air on Wednesday, Jan 15 on Red Mountain in the southern Madison Range (just west of Ernest Miller Ridge).

It appears to be on an east facing slope at around 9800 ft.

USFS Snow rangers commuting to and from West Yellowstone noticed a human-triggered avalanche across the Gallatin River from Bacon Rind. Photo: K. Marvinney

USFS Snow rangers commuting to and from West Yellowstone noticed a human-triggered avalanche across the Gallatin River from Bacon Rind. Photo: K. Marvinney

While driving to and from West Yellowstone today, I noticed what is potentially a skier/snowboarder triggered avalanche on the east side of HWY 191 on a West/Southwesterly aspect, directly across the highway from the Bacon Rind Area and Snowslide Creek.  There were numerous tracks through steep rocky chutes next to the road, one of which had avalanched perhaps 75' wide, 18-24" deep, and running nearly to the flats at the base of the slope.  Judging by the thin layer of fresh snow it potentially happened on Sunday or maybe Monday.  There were tracks through the cliffs above the slide and coming out of the slide.