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Archived

Avalanche Forecast

Apr 4th, 2022–Apr 5th, 2022
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
3: Considerable
The avalanche danger rating below treeline will be considerable

Regions: Northwest Coastal.

Keep an eye on the wind and snow transport. Slabs may be especially touchy where they overlie a crust.

Confidence

Moderate - Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack.

Weather Forecast

Monday night: Cloudy with isolated flurries, trace to 10 cm. Increasingly strong west wind. Ridgetop low -8 C.

Tuesday: Unsettled with flurries, 5-15 cm. Moderate southwest-west wind. Ridgetop high -4 C.

Wednesday: Snow, 10-20 cm. Moderate south wind gusting to extreme. Ridgetop high -2 C.

Thursday: Heavy Snow, 40 cm. Strong ridge wind gusting to 50 km/h. Ridgetop high -1 C.

Avalanche Summary

Early Monday morning, in the north of the region, workers reported a natural wind slab on a northwest aspect with a 60 cm depth.

On Sunday, a large (size 2.5) natural storm slab avalanche was observed on a north aspect at 1600m. Throughout the region, explosives triggered numerous storm and wind slab avalanches to size 2.5. 

Late Saturday and early Sunday morning, explosives triggered storm slab avalanches to size 2 (and one 2.5) in the northern end of the region.

Snowpack Summary

20-50 cm wind slabs and wind affected snow sits over a crust on all aspects and elevations except high elevation north-facing terrain. In the north of the region, small surface hoar may be found above this crust where this layer continues to display poor (sudden fracture characteristics) results in snowpack tests.

Terrain and Travel

  • Make conservative terrain choices and avoid overhead hazard.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.

Avalanche Problems

Wind Slabs

Slabs may remain reactive as steady winds continue to move loose snow. Recent winds have shifted from southerly to northeast to west, possibly reverse loading features and building slabs in less common terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5