Lawinenlagebericht

Summit Lake

Chugach National Forest Avalanche Center
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Lawinengefahr

Tue
Hochgebirge
2 · Mässig
Waldgrenze
1 · Gering
Unterhalb
1 · Gering
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Veraltet — dieser Lagebericht ist 2 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

There is a small chance of triggereing an old wind slab in the higher elevations from the easterly winds last week. Additionally, it is unlikely but a surprise avalanche could be triggered that breaks near the ground in wind loaded bowls and gullies. Lastly, keep a lookout for glide cracks and limit time under these.

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SPECIAL ANNOUNCEMENTS:

Free avalanche outreach events next week on the Kenai Peninsula!

  • Wednesday, Feb. 26 at the Kenai River Brewery in Soldotna from 6:00 to 7:00 pm - Join forecaster Daniel Krueger to talk about the state of the snowpacks and useful backcountry tips and tricks. More info here.
  • Thursday, Feb. 27 at the Breeze Inn Hotel in Seward from 6:00 to 7:30 pm. Join forecaster Mik Dalpes to talk about the state of the snowpacks, mapping resources, and how to interpret stability tests. More info here.

Lawinenprobleme

  • Deep Persistent Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Unlikely
    Größe
    2–3

    Recent Avalanches:  On Saturday there were four snowmachine-triggered avalanches and two cornice falls on the backside of Seattle Ridge. No one caught. These were triggered remotely and were 6 to 12" deep. More info here and here. There was also a cornice fall into PMS Bowl on Magnum Ridge (pictured below). Down south in Seward there was a skier-triggered large wind slab avalanche on Mt Alice. The skier was initially caught then able to escape unharmed. We did not hear of any slab avalanches yesterday. Big thanks to everyone for relaying their respective information. 

    None of these avalanches occurred in the Summit Lake area. The last avalanche that we know of here was from Thursday/Friday last week on John Mtn. We are still hoping to get more information but it was likely a large natural that broke into those weak layers at the base of snowpack. This was during the strong east winds at that time. For today, keep you eyes peeled for wind loaded slopes. There could be some stiff old wind slabs to avoid along with the big open bowls that harbor those buried weak layers. Watching for red flags like shooting cracks and whumpfing is also key.

    Sun Effect:  The southerly slopes got quite warm yesterday as the sun broke through the clouds. There was also some 'greenhousing' going on making it feel really warm (one of my grad school advisors does a good job at explaining this effect HERE). We can guess these aspects are crusted over this morning but should warm enough again today to soften those sun crusts to some degree. Warming can also cause cornices to start peeling off and becoming easier to trigger so heads up.

    Glide Avalanches: We're continuing to see glide cracks open and release every now and then. These avalanches are large and unpredictable, so the only way to manage this problem is to avoid spending time under cracks.

    (2/20/2025)

    Snowpack at 2,400' on Summit Mountain. Poor structure exists with a weak layer of facets below a large 3' slab. 

    Photo: Mik Dalpes

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