Two avalanches were observed. The first is thought to be natural, but likely triggered form people in the area, either directly or remotely, and the second observed to be human triggered. The report came from someone who was observing this from a long distance away on the Marmot ridgeline.
Light precipitation was occurring at Hatcher Pass. Rain began around government peak and moved into the area in the afternoon. While they observed no rain on Marmot, they did speak to others who were at the top of Hatch Peak around the time of these avalanches who said they turned around because of rain.
The observer saw what appeared to be a natural avalanche, marked #1 in photo, and confirmed that it was slow moving and may have had some amount of rain saturated snow in it. It was long running and reached the creek bottom in the Valley of Sin, somewhat visible in this photo.
The second avalanche, marked #2 in photo, appeared to be triggered by some backcountry users who were traveling with a dog. It appeared to the observer that the group was involved in the avalanche but were able to get out of it. The observer was not able to contact the group involved and did not run into them later in the day.
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