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Archived

Avalanche Forecast

Mar 31st, 2018–Apr 1st, 2018
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
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
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

Regions: Lizard-Flathead.

Watch for wind slabs in terrain features near ridges. Also be cautious of your overhead exposure, as cornice falls could trigger slab avalanches.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

SUNDAY: Cloudy with light snowfall, accumulation 2 to 5 cm with possible localized higher amounts from convective flurries, light to moderate southwesterly winds, alpine temperature -6 C, freezing level 1000 m.MONDAY: Cloudy with snowfall, accumulation 10 to 15 cm, light northeasterly winds, alpine temperature -12 C, freezing level 700 m.TUESDAY: Partly cloudy with light snowfall, light westerly winds, alpine temperature -6 C, freezing level 1000 m.

Avalanche Summary

On Friday, loose avalanches were reported from steep alpine terrain on easterly aspects.  One small slab avalanche was triggered by a cornice fall, also in steep alpine terrain.

Snowpack Summary

Wind slabs may exist on all aspects at higher elevations from recent snowfall and variable wind directions.  Expect to find a melt-freeze crust on the surface on sunny aspects and all aspects below 1700 m. A surface hoar and crust layer is found around treeline at a depth of about 60 cm, with surface hoar on northerly aspects and the crust elsewhere.  At ridgetop, cornices are large and have been failing the past few days.Deeper in the snowpack, the late-November weak layer is composed of sugary facets around a crust, which is buried around 200 to 300 cm and is currently dormant.

Avalanche Problems

Wind Slabs

Wind slabs exist in exposed terrain features. Assess the snow for slab properties and the bond with underlying layers. Be particularly cautious when travelling on or below ridges, as cornices are weak and they could trigger slabs on slopes below.
Pay attention to overhead hazards like cornices, which could trigger slabs on slopes below.Use ridges or ribs to avoid pockets of wind-loaded snow.Watch for wind slabs on all aspects due to variable wind directions.

Aspects: All aspects.

Elevations: Alpine.

Likelihood: Possible

Expected Size: 1 - 2