Archived

Avalanche Forecast

Dec 2nd, 2017–Dec 3rd, 2017

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

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

1: Low

The avalanche danger rating in the alpine will be low

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

Regions: Sea To Sky.

The lure of powder slopes and sunny skies will be strong on Sunday. Take a cautious approach towards more aggressive terrain - especially steep, wind-affected terrain.

Confidence

Moderate - Due to the number of field observations

Weather Forecast

We'll see a clearing trend on Sunday and fine weather during the week.Sunday: Clearing in the morning and then dry with some sunny breaks. Light northwesterly winds. Freezing levels 800m.Monday: Sunny with cloudy periods. Freezing levels around 600 m. Light northwesterly winds.Tuesday: Mainly sunny and becoming warm up high. Freezing levels rising to 2000 m. Light northerly winds.

Avalanche Summary

On Saturday, control work with explosives gave mostly Size 1 soft slabs. Over the past three days, ski cutting has consistently produced soft slab avalanches on lee and cross-loaded features, running to size 1.5 in the storm snow at treeline and alpine elevations. On Friday, most slabs triggered were approximately 25cm thick, running on a density change within the recent storm snow.

Snowpack Summary

Approximately 40-60 cm new snow now sits on top of a rain crust (or multiple crusts) that formed during the wet weather at the end of November. Strong (southerly) winds have blown snow around in exposed areas creating drifts and scoured areas. The main areas of concern are lee (northerly) and cross-loaded features in the alpine and treeline elevation bands. Snowpack depths are typically around 150 cm in sheltered treeline locations, although deeper (and shallower) spots certainly exist on account of the strong winds.

Avalanche Problems

Wind Slabs

Wind slabs have been building over a crust layer. This layer may slide easily, particularly on steep convex terrain or where the wind has blown it into more cohesive slabs.

Use ridges or ribs to avoid pockets of wind loaded snow.Avoid steep lee and cross-loaded featuresBe alert to changing snow conditions, especially where the snow firms up or sounds hollow.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2