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Avalanche Forecast

Archived

Mar 4th, 2022–Mar 5th, 2022

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.

Regions

Yukon.

The weather is going to bring a little bit of everything this weekend. Sunshine, warm temperatures, clouds, wind, and snow. Pay attention to changing avalanche conditions as mother nature does her thing. 

Confidence

Moderate - Uncertainty is due to the timing of the incoming weather system.

Weather Forecast

Friday night: Mostly clear with clouds moving in later in the evening. No precipitation. Winds light from the south. The overnight temperature will be -7°C. 

Saturday: Lingering moisture in the atmosphere will result in a mostly cloudy day. Wet flurries are possible amounting to 2cm of snow. Winds will be moderate from the south. Temperatures will start at around -5°C in the morning and rise to -1°C by the afternoon. 

Sunday: Warm and moist as the storm rolls in. Mostly cloudy until the early afternoon with the potential for clearing later in the afternoon. 5-15cm of new snow overnight Saturday and into Sunday morning with freezing rain possible at highway elevation. Moderate to strong winds from the south. Temperature around -2°C overnight rising to 0°C 

Monday: Clear and sunny. No precipitation. Light north winds. A low of -12°C and a high of -8°C. 

Avalanche Summary

The most recently reported avalanches in White Pass are now 48-72hrs old. 

Snowpack Summary

We have 15-30cm of low density snow sitting on old firm surfaces. On some north aspects in the alpine, this snow exists as firmer wind slab. The bond between this snow and these firm surfaces continues to improve daily. On steep, south aspects at treeline and below, there is potential for the existence of a thin sun crust. 

The lower snowpack is well bridged and it is unlikely that avalanches will be triggered on weak, sugary crystals near the ground at this time. 

Terrain and Travel

  • Watch for wind-loaded pockets especially around ridgecrest and in extreme terrain.
  • Small avalanches can have serious consequences in extreme terrain. Carefully evaluate your line for wind slab hazard before you commit to it.
  • Caution around slopes that are exposed to cornices overhead.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.