Bollettino valanghe

Northern Wallowas

Wallowa Avalanche Center
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Pericolo valanghe

Sat
Alta quota
3 · Marcato
Limite del bosco
3 · Marcato
Sotto il limite
1 · Debole
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Non aggiornato — questo bollettino è scaduto 6 months ago. Stai vedendo condizioni passate, non il bollettino in corso.

In sintesi

There are persistent weak layers buried about 2-3 feet deep that may allow you onto some steep slopes without any obvious signs of instability, such as cracking or collapsing, before releasing, and it is too late. Triggering avalanches is also possible on steep slopes that are mostly sheltered from the wind. Look for simple terrain and avoid traveling beneath steep slopes.  Small wet avalanches are likely in very steep, rocky terrain facing the sun. 

Today's forecast is sponsored by: Quickhatch Provisions

Problemi valanghivi

  • Persistent Slabs

    • Alta quota
    • Limite del bosco
    • Sotto il limite del bosco
    Probabilità
    Possible
    Dimensione
    1.5–2.5

    The Valentine's Buried Surface Hoar layer, along with weak faceted snow around the 2/8 interface, has been found in the upper 3 feet of the snowpack. If you trigger a slab avalanche on either or both of these fragile weak layers, you will likely produce a large to very large avalanche. Unfortunately, you will likely not observe Red Flag warnings to alert you that weak snow is beneath you. This is not an avalanche problem that can be managed, like smaller storm and wind slabs.

    Sticking to simple terrain and avoiding traveling beneath steep slopes is our best advice. Continue to monitor the observations and read the entire forecast daily. This problem is not going to go away overnight, and trying to outsmart it could be dangerous.

    Persistent Slab avalanches can release in surprising ways:

    •  They can be much wider than expected 
    • They can break above you and pull into relatively gentle terrain.
    • You can trigger them remotely—from flat terrain below, above, and to the sides of steep slopes.  

    (2/26/2026)

    2 Natural Avalanches observed near Pine Lakes in the Southern Wallowas.  

    Photo: Victor McNeil

  • Wind Slabs

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

    A fresh batch of wind slabs developed with the storm that occurred February 23-24th. Triggering even a small wind slab could produce a much larger Persistent Slab avalanche. Avoid traveling on terrain stiffened by the wind.  

    Look for clues to wind slab development:  A stiff and rippled texture, snow stripped terrain upwind of loaded slopes, cornice development, and fresh dunes of snow drifts.   Avoid wind-loaded slopes steeper than 30 degrees.  

    (2/25/2026)

    Chief Joseph Mountain 

    Photo: Caleb Merrill

Avalanche Discussion

Persistent Slab: The likelihood of triggering a large, destructive avalanche will increase as you enter terrain where a slab has formed over weaker snow. With increasingly warmer daytime temperatures and an increasing Freezing Level through this weekend, a more cohesive slab will develop near the surface. You will likely not observe warning signs until it's too late. Don't let a lack of natural avalanche activity or Red Flags fool you into complacency. 

Snowpack structure can vary from one drainage to another. This can influence the complexity of managing our persistent slab problem.  Remember that elevation bands are not definite boundaries; for example, the interior typically receives more snow and less wind than the perimeter. Use the forecast as a starting point, but continue assessing conditions as you travel.    

Careful snowpack evaluation and conservative decisions will be critical in the coming weeks, given the continued possibility of overlapping new (wind and storm) and old snow problems (buried surface hoar and/or January facets). Choosing low-consequence terrain will be the key to successfully managing these hazards. 

Wet Loose: As daytime highs increase over the next several days, along with an increasing Freezing Level, the likelihood of Wet Loose avalanches will increase. Primarily occurring on steep slopes, with rocks and trees, which absorb the sun's heat. Avoid hanging out under sun-drenched slopes and look for roller balls and pinwheels as indicators of Wet Loose activity.  

Observations: If you are out in the mountains, please send us an observation of what you saw. All observations are noteworthy and greatly help the forecasters. If you don't want everyone to see where you went, you can set it to private so only the forecasters will see it. 

Beacon Parks: Thank you to everyone who helped establish the beacon training park at Anthony Lakes (across from the ski lift on Mud Lake) and near the warming shelter at Salt Creek Summit snopark outside of Joseph, OR. These are free tools that we should all take advantage of.  

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