Archived

Avalanche Forecast

Dec 6th, 2017–Dec 7th, 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

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

Regions: South Coast Inland.

Alpine temperatures are sky rocketing! Dial back your terrain choices when the snow gets moist or mushy and avoid cliffs, gullies, and steep slopes with trees.

Confidence

High - The weather pattern is stable

Weather Forecast

THURSDAY: Alpine sun with some valley clouds, light wind, freezing level up to 3200 m with inversions in the valleys.FRIDAY: Alpine sun with some valley clouds, light wind, freezing level around 3000 m with inversions in the valleys.SATURDAY: Increasing cloud, moderate west wind, freezing level around 2700 m with inversions in the valleys.

Avalanche Summary

Little notable avalanche activity has been reported lately. Small lingering wind slabs have been reported in southern sections (Coquihalla) while small dry loose avalanches in steep terrain have been reported in the north of the region (Duffey Lake zone). On Tuesday, there were some reports of a few small loose avalanches steep south-facing slopes, showing the initial effects of the warm weather. More wet loose activity can be expected thanks to the sustained warming this week.

Snowpack Summary

Dramatic warming will cause widespread melting of the surface snow, especially on south-facing slopes. Crusts may form overnight, but will melt quickly in the mornings. The 30-50 cm of storm snow that fell last week is rapidly settling above the late November rain crust. The crust is reported to be thick (15 cm) below treeline and thin (2 cm) in the alpine. Southerly winds have blown snow around in exposed areas creating drifts and scoured areas. Stubborn wind slabs have formed near ridge crests and lee features, primarily in the south of the region (Coquihalla area). Treeline snow depths are approximately 1 m throughout the region.

Avalanche Problems

Loose Wet

Conditions will be more like spring than winter later this week. Surface snow layers can become weak when hit by the sun. Minimize your exposure to terrain traps - even small sluffs can push you into dangerous terrain.

Use caution above cliffs and terrain traps where small avalanches may have severe consequences.Use extra caution on sunny slopes or if the snow is moist or wet.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Wind Slabs

Small wind slabs are possible in steep terrain behind ridge lines, especially in the south of the region (Coquihalla area). On steep slopes, the new snow may not bond well to the underlying crust.

Use increased caution in downwind areas. Recent snowfall and wind loading have created wind slabs.Use ridges or ribs to avoid pockets of wind loaded snow.Be 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: Unlikely - Possible

Expected Size: 1 - 2