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Avalanche Forecast

Archived

Apr 16th, 2022–Apr 17th, 2022

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Inland.

Normal cautions should be sufficient for you to manage lingering hazards like cornices and stubborn wind slabs.

Don't forget to check out the newest forecaster blog as you plan your spring objectives.

Confidence

High -

Weather Forecast

SATURDAY NIGHT: Increasing cloud. Light southwest winds.

SUNDAY: Mainly sunny. Light southwest winds. Treeline high temperatures rises around -5.

MONDAY: Increasing cloud and flurries bringing a trace of new snow in the afternoon and continuing overnight. Moderate to strong east or southeast winds. Treeline high temperatures around -6.

TUESDAY: Diminishing cloud and flurries with about 5 total cm of new snow. Light northeast winds. Treeline high temperatures around -5.

Avalanche Summary

One recent cornice fall that did manage to trigger a slab was reported from a flight over the Telkwa range on Friday. Otherwise no new avalanches have been reported.

On Thursday, explosives triggered wind slabs up to size 2 on south-south east aspects. On Wednesday, glacial icefall (serac) triggered a large persistent slab avalanche (size 3). This avalanche occurred on o northeast aspect in the alpine and is suspected to have failed on a crust from early April. The triggering of this avalanche was only possible with an extremely large load and is not representative of the general conditions of the region as a whole.

Looking forward, avalanche activity is unlikely given the current cool, unsettled weather trend. However, always be ready for the possibility of pockets of wind slabs in steep alpine terrain, cornice failures, and wet loose avalanches if the sun is out.

Snowpack Summary

Open terrain has been wind-affected, with recent wind scouring southeast slopes and loading snow onto east and north-facing slopes. Sheltered areas may still have soft snow. A 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 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.