Weather and Avalanche Log for Wed Feb 7, 2024
AVALANCHE WARNING for Island Park, Lionhead, S. Madison, S. Gallatin
AVALANCHE WARNING for Island Park, Lionhead, S. Madison, S. Gallatin
<p><span><span><span><span><span><span>We are continuing an Avalanche Warning in the southern Gallatin and southern Madison Ranges, the Lionhead area and Island Park. Very dangerous avalanche conditions exist. </span></span></span></span></span></span></p>
<p><span><span><span><span><span><span>Island Park received a foot of new snow with 50+ mph wind gusts. The southern mountains, including West Yellowstone picked up another 6”. It has been snowing since Friday with Island Park receiving a total of 28” (3” </span></span></span></span></span></span><a href="https://avalanche.org/avalanche-encyclopedia/snowpack/snowpack-observat… water equivalent</span></span></u></span></span></span></span></span></a><span><span><span><span><span><span>) and 18” in Lionhead and the southern mountains (1.6-2” </span></span></span></span></span></span><a href="https://avalanche.org/avalanche-encyclopedia/snowpack/snowpack-observat…;). The snowpack is weak and unstable and the weight of the new snow will cause widespread avalanches. It is still snowing and blowing. On Monday, Dave and I threaded our way up Bacon Rind and triggered collapses and wide cracks every time we stepped off the skin track (</span></span></span></span></span></span><a href="https://youtu.be/zcBGHzPcXtw"><span><span><span><strong><span><u><span>…; and </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/30508"><span><span><span><strong><span…;). More snow since then is keeping the backcountry dangerous and triggering a deadly avalanche is very likely. </span></span></span></span></span></span><span><span><span><span><em><u><span><span>Today is a day to avoid being on or underneath avalanche terrain</span></span></u></em></span></span></span></span><span><span><span><span><span><span>. The avalanche danger is HIGH. </span></span></span></span></span></span></p>
<p><span><span><span><span><span><span>Since Friday, the mountains around Bozeman, Big Sky, and Cooke City have been incrementally loading every day with a total snowfall of 8-12” (0.8-1.2” of </span></span></span></span></span></span><a href="https://avalanche.org/avalanche-encyclopedia/snowpack/snowpack-observat…;). Avalanche activity early in the week in </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/30495"><span><span><span><strong><span… Basin</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span> and in the </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/30517"><span><span><span><strong><span… Range</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span> point to a snowpack with poor stability. In Cooke City, Alex has been skiing and riding and found a dangerous snowpack both north (</span></span></span></span></span></span><a href="https://youtube.com/shorts/c7XwPvZ93ZU?feature=share"><span><span><span…;) and south (</span></span></span></span></span></span><a href="https://youtube.com/shorts/uJXOKijsY38?feature=share"><span><span><span…;) of town. A sledder confirmed the poor stability when he triggered a slide in “The Plug” on Highway 212 east of town (</span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/30537"><span><span><span><strong><span… and photo</span></span></u></span></strong></span></span></span></a><span><span><span><span><span><span>). </span></span></span></span></span></span></p>
<p><span><span><span><span><span><span>Ian and I skied into Beehive Basin yesterday. The snowfall since Friday has doubled the slab depth above our problematic December weak layers (</span></span></span></span></span></span><a href="https://youtube.com/shorts/doG4m6lbQqY?feature=share"><span><span><span…; and </span></span></span></span></span></span><a href="https://www.mtavalanche.com/node/30528"><span><span><span><strong><span…;). Traveling in avalanche terrain is dangerous. As it keeps snowing it will get easier to trigger slides 1-2 feet deep. Passing beneath steep slopes is not advised as collapses warn us that we can trigger slides from flat ground. The avalanche danger is CONSIDERABLE.</span></span></span></span></span></span></p>
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Observed an avalanche above Highway 212 ("the plug") just north of the Wyoming/Montana border. that appeared to be triggered by a snowmobile. It looked fresh, likely from the afternoon of 2/6/2024. Northeast facing slope, 8200'. Technically out of the advisory area.
From obs: "Observed an avalanche above Highway 212 ("the plug") just north of the Wyoming/Montana border. that appeared to be triggered by a snowmobile. It looked fresh, likely from the afternoon of 2/6/2024. Northeast facing slope, 8200'. Technically out of the advisory area." Photo: N. Gaddy
From obs: "Observed an avalanche above Highway 212 ("the plug") just north of the Wyoming/Montana border. that appeared to be triggered by a snowmobile. It looked fresh, likely from the afternoon of 2/6/2024. Northeast facing slope, 8200'. Technically out of the advisory area." Photo: N. Gaddy
Observed an avalanche above Highway 212 ("the plug") just north of the Wyoming/Montana border. that appeared to be triggered by a snowmobile. It looked fresh, likely from the afternoon of 2/6/2024. Northeast facing slope, 8200'. Technically out of the advisory area.
Evidence of an old natural slide on the lee side of Henderson Mountain.
No obvious signs of instability or cause for concern on the relatively mellow route up the ridge, but would definitely avoid the lee sides of that area where there was significant cornice formation.
We rode South Plateau the last three days. The snow has been stable on steep slopes. We did observe a fresh powder layer of 24" with an ice layer beneath that is roughly 4" thick and faceted snow another 12" down with another ice layer. The snow has been very stable while we are riding and we have not observed any slides or had any issues.
Snowmobilers near Henderson Mt. saw several small loose snow avalanches near the top of the ridge. These avalanches were isolated to the new snow.