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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

Northwest Inland.

Avalanche conditions are generally safe. Watch for small pockets of wind slabs in steep terrain and remember that cornices are large and fragile.

Confidence

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

Weather Forecast

THURSDAY NIGHT: Partially cloudy with the chance of light flurries. Light southwesterly winds. Freezing level lowering to 500 m.

FRIDAY: Mainly cloudy with light flurries in the afternoon. Light southwesterly winds. Freezing level rising to 1500 m. Treeline temperatures around -1 C.

SATURDAY: Cloudy with snowfall, up to 5 cm of accumulation. Moderate to strong southerly winds. Freezing level rising to 1500 m. Treeline temperatures around -1 C.

SUNDAY: Cloudy with light flurries. Light to moderate southwesterly winds. Freezing level rising to 1300 m. Treeline temperatures around -3 C.

Avalanche Summary

No new avalanches have been reported over the past week. 

Reports are limited at this time of year. Please let us know what you're seeing by filling out a MIN report!

Snowpack Summary

A light amount of new snow has landed on heavily wind-affected surfaces in exposed terrain, the product of an intense wind event early last week. In sheltered areas, the flurries may have added to limited stashes of soft, potentially faceted snow. A crust will likely be found on steep solar aspects and at low elevations from warm temperatures and sun yesterday. A more widespread melt-freeze crust can be found 20 to 50 cm deep in most areas, and up to 80 cm in the snowiest parts of the region. This crust is near the surface below 1200 m.

Terrain and Travel

  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • Watch for unstable snow on specific terrain features, especially when the snow is moist or wet.
  • Watch for wind-loaded pockets especially around ridgecrest and in extreme terrain.

Problems

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.