Archived

Avalanche Forecast

Nov 25th, 2017–Nov 26th, 2017

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

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

3: Considerable

The avalanche danger rating below treeline will be considerable

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

3: Considerable

The avalanche danger rating below treeline will be considerable

Regions: Glacier.

Challenging travel conditions remain in the wake of last week's rainstorm.

Weather Forecast

Cloudy skies with isolated flurries and trace amounts of accumulation. Freezing level at 1300m and ridge winds SW 25-45Km/h. A moisture laden system will track inland Sunday bringing strong SW winds and 60mm of precipitation to Rogers Pass by Tuesday afternoon. Freezing levels are expected to rise to 1900m, meaning 60mm of rain below tree line.

Snowpack Summary

20cm of dry snow is beginning to bond to a breakable crust. Below the November 23 crust sits a weak rain-saturated snowpack. If you take your skis off, you'll likely be standing in a hole up to your waste. Strong winds during the last storm created isolated pockets of wind slab in the alpine on northerly features. October 31 crust is down 100cm.

Avalanche Summary

Natural avalanche activity has dropped off since the recent rain storm.

Confidence

Freezing levels are uncertain

Avalanche Problems

Wet Slabs

Dry surface snow is insulating a rain-saturated wet slab that extends almost to the ground. This is a snowpack weakness that will only heal with cold. Given the mild weather forecast, this layer is expected to persists for several days.

Avoid steep, open slopes.Use extra caution on slopes if the snow is moist or wet.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible

Expected Size: 2 - 3

Wind Slabs

Extreme southerly winds accompanied the November 22nd storm and created reactive wind slabs. This problem is isolated to leeward pockets in the alpine due to intense rainfall and warmer temps at lower elevations during the storm.

Use caution in lee areas. Recent wind loading has created wind slabs.

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

Elevations: Alpine.

Likelihood: Possible

Expected Size: 2 - 3