22-23

Miller Ridge avalanche

Date
Activity
Skiing

Saw this natural D2 soft slab off the east aspect of Miller Ridge. The crown looks shallow, so I’m guessing it ran at the storm interface.

No other avalanches or signs of instability observed. Winds were light out of the NW and the HN of the settled snow was about 10cm.

Region
Cooke City
Location (from list)
Miller Ridge
Observer Name
Nina Hance

Many natural avalanches in Island Park

Sawtelle Peak
Island Park
Code
HS-N
Latitude
44.56110
Longitude
-111.44300
Notes

From the FAA road up Sawtelle Peak outside Island Park we were able to see many crown lines and debris piles from the last 2 days of Avalanche Warnings. Most avalanches involved new snow, but there was 1 deep avalanche on Mt. Jefferson's east face that was large (D3). The FAA did avalanche control and an avalauncher round triggered a small, but deep slide (2-5' deep) and a larger explosive on another slope yielded no results. We saw 8 backcountry avalanches from the road. These were east and north facing, the only aspects available for viewing.

The snowfall totaled 3' and it will take a few days for the snowpack to become more stable. In the meantime, be patient and stay off of steep slopes.

Number of slides
8
Number caught
0
Number buried
0
Avalanche Type
Hard slab avalanche
Trigger
Natural trigger
Problem Type
New Snow
Snow Observation Source
Slab Thickness units
centimeters
Single / Multiple / Red Flag
Multiple Avalanches
Advisory Year

From the FAA road up Sawtelle Peak outside Island Park we were able to see many crown lines and debris piles from the last 2 days of Avalanche Warnings. Most avalanches involved new snow, but there was 1 deep avalanche on Mt. Jefferson's east face that was large (D3). The FAA did avalanche control and an avalauncher round triggered a small, but deep slide (2-5' deep) and a larger explosive on another slope yielded no results. We saw 8 separate avalanches from the road. These were east and north facing, the only aspects available for viewing.

Island Park, 2023-03-16

From the FAA road up Sawtelle Peak outside Island Park we were able to see many crown lines and debris piles from the last 2 days of Avalanche Warnings. Most avalanches involved new snow, but there was 1 deep avalanche on Mt. Jefferson's east face that was large (D3). The FAA did avalanche control and an avalauncher round triggered a small, but deep slide (2-5' deep) and a larger explosive on another slope yielded no results. We saw 8 separate avalanches from the road. These were east and north facing, the only aspects available for viewing.

Island Park, 2023-03-16

From the FAA road up Sawtelle Peak outside Island Park we were able to see many crown lines and debris piles from the last 2 days of Avalanche Warnings. Most avalanches involved new snow, but there was 1 deep avalanche on Mt. Jefferson's east face that was large (D3). The FAA did avalanche control and an avalauncher round triggered a small, but deep slide (2-5' deep) and a larger explosive on another slope yielded no results. We saw 8 separate avalanches from the road. These were east and north facing, the only aspects available for viewing.

Island Park, 2023-03-16

From the FAA road up Sawtelle Peak outside Island Park we were able to see many crown lines and debris piles from the last 2 days of Avalanche Warnings. Most avalanches involved new snow, but there was 1 deep avalanche on Mt. Jefferson's east face that was large (D3). The FAA did avalanche control and an avalauncher round triggered a small, but deep slide (2-5' deep) and a larger explosive on another slope yielded no results. We saw 8 separate avalanches from the road. These were east and north facing, the only aspects available for viewing.

Island Park, 2023-03-16

Many natural avalanches in Island Park

Date
Activity
Snowmobiling

From the FAA road up Sawtelle Peak outside Island Park we were able to see many crown lines and debris piles from the last 2 days of Avalanche Warnings. Most avalanches involved new snow, but there was 1 deep avalanche on Mt. Jefferson's east face that was large (D3). The FAA did avalanche control and an avalauncher round triggered a small, but deep slide (2-5' deep) and a larger explosive on another slope yielded no results. We saw 8 backcountry avalanches from the road. These were east and north facing, the only aspects available for viewing.

The snowfall totaled 3' and it will take a few days for the snowpack to become more stable. In the meantime, be patient and stay off of steep slopes.

Region
Island Park
Location (from list)
Sawtelle Peak
Observer Name
Doug Chabot

GNFAC Avalanche Forecast for Thu Mar 16, 2023

Snowpack and Avalanche Discussion

<p><span><span><span><span><span><span>The Avalanche Warning has expired for the southern mountains. The storm began late Monday and dropped 2-3 feet of snow (2-2.5” </span></span></span></span></span></span><a href="http://snow.wyo.gov/snow-surveys/snow-water-equivalent-swe"><span><span… water equivalent</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span>) with strong westerly wind. This new snow will create avalanches, but deeply buried weak layers could create even bigger slides; either would be deadly. Dave and Ian rode into Tepee Basin in the southern Madison Range and found 2 feet of new snow and saw a avalanches that had broken during the storm (</span></span></span></span></span></span><a href="https://youtu.be/_eAH-TlOPUU"><span><span><span><strong><span><u><span>…;, </span></span></span></span></span></span><a href="http://www.mtavalanche.com/node/28654"><span><span><span><strong><span>…;). They even saw a couple avalanches near Bacon Rind on the drive home (</span></span></span></span></span></span><a href="http://www.mtavalanche.com/images/23/avalanche-gallatin-river-near-baco…;).</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Today will become sunny and calm. It will be a great day to be in the mountains, but also a dangerous one. The snowpack needs time to adjust to its new load and will be sensitive to triggering today. We cannot rush Mother Nature. Staying off of slopes steeper than 30-degrees (avalanche terrain) is a given, yet we also need to stay away from flatter terrain at the bottom of slopes so we do not get buried from above. Sunny skies embolden us, but the snowpack doesn’t care.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>The avalanche danger is rated CONSIDERABLE on all slopes.</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>The Bridger Range, Hyalite and Big Sky area picked up 11-14” of snow in a surprisingly robust storm. This snow added .8-1.5” of </span></span></span></span></span></span><a href="http://snow.wyo.gov/snow-surveys/snow-water-equivalent-swe"><span><span…; to the snowpack, a fair bit of weight. As Ian noted in our </span></span></span></span></span></span><a href="https://youtu.be/5P0-B8ATr70"><span><span><span><strong><span><u><span>… from Buck Ridge</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span> on Tuesday, even a little snow is concerning because weak layers 3-5 feet deep could avalanche on a few slopes. Yesterday’s storm was a wallop to the snowpack and we need to travel cautiously by avoiding avalanche terrain. Cornices along ridgelines will be touchy and could trigger slopes below. Furthermore, a person could trigger an avalanche in the new snow which could then trigger a deeper avalanche. The mechanics are not important, just that dangerous avalanche conditions exist. Sunny skies are </span></span></span></span></span></span><a href="https://en.wikipedia.org/wiki/Siren_(mythology)"><span><span><span><str…; calling you forth, only to dash your well laid plans in an avalanche.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>The avalanche danger is rated CONSIDERABLE since triggering a slide is likely.&nbsp;</span></span></span></span></span></span></p>

<p><span><span><span><span><span><span>Please share avalanche, snowpack or weather observations via our</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/add/snow_obs"><span><span><span><span>…; </span></span></u></span></span></span></span></span><span><span><span><strong><span><u><span><span>website</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>, email (</span></span></span></span></span></span><span><span><span><strong><span><span>mtavalanche@gmail.com</span></span></strong></span></span></span><span><span><span><span><span><span>), phone (406-587-6984), or Instagram (#gnfacobs). </span></span></span></span></span></span></p>

<p>The Avalanche Warning has expired for the southern mountains. The storm began late Monday and dropped 2-3 feet of snow with strong westerly wind. This new snow will create avalanches, but deeply buried weak layers could create even bigger slides; either would be deadly. The snowpack needs time to adjust to its new load and will be sensitive to triggering today. Staying off of slopes steeper than 30-degrees (avalanche terrain) is a given, yet we also need to stay away from flatter terrain at the bottom of slopes so we do not get buried from above.</p>

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