Bollettino valanghe

Seward and Lost Lake

Chugach National Forest Avalanche Center
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Pericolo valanghe

Thu
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
2 · Moderato
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In sintesi

Dangerous avalanche conditions exist and human triggered avalanches 2 to 3’ deep are likely above 1,500’. This avalanche problem is extremely challenging to assess and has been responsible for multiple human triggered avalanches. We recommend a cautious approach and keep in mind that people have been triggering large avalanches remotely from low angle slopes.

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SPECIAL ANNOUNCEMENTS:

We are sorry to report a fatal avalanche accident that occurred outside of Girdwood on the afternoon of March 4, 2025. Three people were caught and killed in an avalanche in the west fork of the Twentymile River. We extend our deepest condolences to the friends and families of all parties involved. We have posted a preliminary accident report on our website. 

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Likely
    Dimensione
    2–3

    Recent Avalanches: Multiple remotely triggered avalanches were reported in the Lost Lake area on Friday.  Large avalanches were seen on mountains surrounding Seward over the weekend including peaks that are closer to Lost Lake. We suspect these are from a layer of surface hoar that is responsible for many avalanches in Turnagain Pass. 

    Dangerous avalanche conditions exist today meaning it will be easy to trigger a large avalanche 2 to 3’ deep on a layer of buried surface hoar. We experienced collapsing snow and shooting cracks yesterday that propagated around 100’ from our snowmachines. These are clues telling us that the snow is still very concerning. Multiple avalanches have been remotely triggered meaning that people traveling on lower angle slopes are triggering avalanches above them or on slopes adjacent to them. Another scary problem we are seeing is that you may not find it on the slope you are on then travel another 100’ and trigger an avalanche. Snow tests also are giving stable and unstable results. Because of these two reasons our biggest concern is that someone decides a slope is safe to ride and then they trigger a large avalanche. 

    These are times when it is important to think about the big picture. There have been multiple human triggered avalanches which likely failed on very weak snow. This layer is extremely challenging to assess. Instead of trying to outsmart the problem the safest option is to make conservative decisions today and ride less consequential terrain away from steep overhead slopes. 

    Loose Avalanches: Look out for dry loose avlanches in dry snow and wet loose avalanches on sunny slopes. These are triggered underneath you and may be larger than expected with the potential to carry a person into trees or off of a cliff.

    Cornices falling will likely trigger a large avalanche above you today. Spend as little time underneath them as possible or avoid them altogether. If you find yourself on a ridge, give them plenty of room. 

    Glide avalanches: Keep in mind if you encounter glide cracks that they can release at any time as a large glide avalanche. If you cannot avoid them try to spend as little time under them as possible. 

  • Wind Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1–2

    There is a chance a person could trigger a wind slab avalanche up to 2’ deep above treeline. Our biggest concern is that triggering a wind slab has the potential to trigger a much larger avalanche on the layer of buried surface hoar. 

    Wind slabs commonly form below ridgelines, rollovers, and in loaded gullies. Look for shooting cracks, collapsing, and snow that becomes stiff underneath you. These are clues telling you that the wind slab has not bonded well to the old snow. The safest option is to look for slopes that are sheltered from the wind.

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