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Avalanche Forecast

Dec 13th, 2019–Dec 14th, 2019
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
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

Regions: Sea To Sky.

The recent snow has added load to buried weak layers and may still be reactive to human triggers. Conservative terrain selection is recommended.

Confidence

Moderate -

Weather Forecast

FRIDAY NIGHT - Cloudy with clear periods and isolated flurries / light northeast winds / alpine low temperature near -7

SATURDAY - Mainly cloudy with isolated flurries / light west winds / alpine high temperature near -7

SUNDAY - A mix of sun and cloud / light northwest winds / alpine high temperature near -9

MONDAY - Cloudy with sunny periods / southwest winds, 20-30 km/h / alpine high temperature near -4

Avalanche Summary

On Friday, there were reports of several explosives triggered and natural avalanches up to size 2.

On Thursday, there were several reports of human and explosives triggered avalanches up to size 2. Some of these avalanches stepped down to a weak crust/facet layer that was buried in mid November.

No new avalanches were reported on Wednesday.

Snowpack Summary

15-25 cm of recent fresh snow likely sits on a weak layer of feathery surface hoar in many areas, as well as sugary faceted snow in some areas. There is a crust from mid November that is now down approximately 45-100 cm. Recent snowpack tests have shown that the snow above the crust is weak and could produce avalanches. The snowpack is unusually shallow and weak for the Sea to Sky region. Snowpack depths range between 80-200 cm and taper quickly at lower elevations.

Avalanche Problems

Storm Slabs

Fresh storm slabs are likely sitting on a weak layer of surface hoar and/or facets. These slabs may be reactive to human triggers, especially in wind loaded areas. The potential exists for storm slabs to step down to a weak layer buried in mid November.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2