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Avalanche Forecast

Archived

Apr 21st, 2022–Apr 22nd, 2022

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

Regions

North Rockies.

Assess steep lines for wind slab and limit exposure to slopes with cornices above.

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

Thursday night: No new snow expected. Light southwest winds and a low of -10 at 2000 m.

Friday: A mix of sun and cloud with no new snow expected and light southwest winds. Freezing level rising to 1900 m.

Saturday: Sunny with no new snow expected. Light southwest winds and freezing levels rising to 1900 m in the north and up to 2300 m in the south.

Sunday: A mix of sun and cloud with no new snow expected. Moderate southeast winds and freezing levels rising to 2300 m.

Avalanche Summary

No recent avalanche activity has been reported. Information is limited at this time of year. Please consider submitting to the Mountain Information Network!

We suspect that small pockets of rider triggerable wind slab could be found in the alpine. As the sun comes out small wet loose avalanches are possible.

Snowpack Summary

Up to 10 cm of recent storm snow has formed pockets of wind slab over old wind effected surfaces. Below this The upper snowpack contains several crusts that extend to mountain top on solar aspects.

The snowpack below treeline is thinning quickly.

Cornices are very large and exposure to slopes beneath them should be minimized, especially if the weather is sunny, warm, or windy. TheĀ 

Terrain and Travel

  • Carefully evaluate steep lines for wind slabs.
  • Minimize your exposure time below cornices.
  • Avoid sun exposed slopes, especially if snow surface is moist or wet.

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.