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Archived

Avalanche Forecast

Apr 11th, 2015–Apr 12th, 2015
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
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
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

Regions: Glacier.

Winter conditions have returned to Rogers Pass.  Minimize overhead exposure and give new snow time to stabilize.

Weather Forecast

A series of fronts continue to pass through the area bringing flurries and colder temps. For today, mainly cloudy with scattered flurries accumulating to 5cm and freezing levels at 1500m.  Moderate westerly  winds with gust to 65km/hr on ridge tops.

Snowpack Summary

20cm of new snow fell overnight with moderate SW winds. The storm layer sits atop a crust on solar aspects and surface hoar on sheltered N aspects. Watch for deeper pockets and wind slab/ cornice development on NE lee features. There are multiple crusts in the top 1m of the snowpack that are reactive to tests but would likely need a large trigger.

Avalanche Summary

No new avalanches observed yesterday. Natural avalanches are expected today with last night's snowfall returning the area to winter conditions.

Confidence

Avalanche Problems

Storm Slabs

20cm of moist snow fell at treeline with consistent SW winds. The storm slab sits atop a crust on solar aspects and surface hoar on sheltered N aspects. Strong winds will continue to develop the slab properties of this layer and increase hazard.
The new snow will require several days to settle and stabilize.Minimize exposure during periods of heavy loading from new snow, wind.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2