Avalanche forecast

West Slopes Central

Northwest Avalanche Center
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Avalanche danger

Wed
Alpine
2 · Moderate
Treeline
2 · Moderate
Below
1 · Low
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Out of date — this forecast expired 6 years ago. You’re viewing past conditions, not the current bulletin.

Highlights

Expect thin wind slabs in upper elevation start zones and along exposed ridgelines. These slabs may be fairly easy to trigger so use caution, or even avoid drifted areas where an avalanche can carry you into rocks, trees, cliffs, or other obstacles. High winds Tuesday afternoon may increase the danger. 

Avalanche problems

  • Wind Slabs

    • Alpine
    • Treeline
    • Below treeline
    Likelihood
    Possible
    Size
    1–2

    We've picked up around 6 inches of new snow in the last 36 hours. Southerly winds stayed in the moderate range (gusts into the upper 20's) for most of that time, but  expect them to strengthen and shift to the east Tuesday afternoon.  Shallow wind slabs exist along ridgelines and in upper elevation terrain features. While I don't expect these slabs to be extensive, you may find reactive pockets that are more than a foot deep.  Smooth drifted snow, firm, or even hollow sounding snow are signs that you may be traveling on one of these slabs.  Avoid them on consequential slopes, or slopes that drain into terrain traps. Small test slopes are a great way to judge the reactivity of the newer snow today. 

    Shallow wind slabs formed Sunday night and Monday. Tuesdays afternoon wind event will create a new batch.

Avalanche Discussion

The recent small amount of new snow has improved conditions, but isn't quite enough to give us the recreational reset we need. The old snow surface is highly variable -- from punchy to hard and everything in between. A week of cold clear weather left slick crusts on sunny aspects and pockets of faceted  crystals on shady aspects. The new snow will sluff easily on steep slopes where the crusts exist and I expect  the new wind slabs to be sensitive in those areas where surface hoar, or near surface facets were buried during the storm. Check out some of the recent weak layer observations here and here.  

Challenging riding conditions will continue as hard and variable snow surfaces hinder travel. Some slopes will ride pretty well, but others will remain tricky. Slide for life conditions remain, especially on steep sunny slopes.  Open creeks present a problem at lower elevations, as well as downed trees and branches from the wind event on Jan 12. Check out this observation for a great description of recent travel conditions. 

During the ongoing Covid-19 pandemic, continue to follow the latest guidance from local, state, and federal health officials. Avoid unnecessary risks that could impact first responders and stress medical resources.  Wear a mask when appropriate, practice social distancing, and consider recreating closer to home.

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