Archived

Avalanche Forecast

Jan 10th, 2018–Jan 11th, 2018

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

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

1: Low

The avalanche danger rating below treeline will be low

Regions: Northwest Coastal.

Potential for a cold, windy day. Watch for building wind slabs, even at low elevation.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

THURSDAY: Cloudy with strong outflow winds. Flurries possible. Alpine temperature near -20.FRIDAY: Clear with light winds. Flurries possible. Alpine temperature near -20.SATURDAY: Cloudy with light winds. 5-10 cm snow. Alpine temperature near 0, but cold in the valleys.

Avalanche Summary

A natural storm slab cycle to size 2 was reported to have run during the storm last Monday. Skiers near Shames reported sluffs running far on Monday. A skier triggered a size 2 wind slab on Sunday on a NW aspect at about 1400 m near Terrace.

Snowpack Summary

The snowpack is variable across the region. Wind slabs and storm slabs may be found on some slopes in the alpine and at treeline. Up to 45 cm recent snow overlies several layers of interest in the upper snowpack. These include crusts, surface hoar and facets. A hard crust with associated facets from mid-December sits deeper in the snowpack, about 60 cm down. Any of these layers could create a persistent slab problem if new snow, wind-loading or warming change the properties of the slab above.The lower snowpack is generally strong, with the exception of areas around Stewart and further north where a basal crust and facets exist.

Avalanche Problems

Wind Slabs

Outflow winds may have left wind slabs that can be triggered by the weight of a person. Wind slabs and storm slabs could step down to weak layers deeper in the snowpack.

Travel on ridgetops to avoid wind slabs on slopes below.Avoid exposure to terrain traps where the consequences of a small avalanche could be serious.

Aspects: North, North East, East, South East, South.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 1 - 3