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Avalanche Forecast

Archived

Dec 8th, 2018–Dec 9th, 2018

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely.

Regions

Sea To Sky.

Snowfall accumulation will increase through the day. If totals exceed 25cm, avalanche hazard will be HIGH.

Confidence

Moderate - Intensity of incoming weather systems is uncertain

Weather Forecast

SATURDAY NIGHT: Cloudy with isolated flurries / Accumulation: trace to 5cm / Alpine temperature: High -1C / Light south ridge wind / Freezing level 1000mSUNDAY: Snow / Accumulation: 25-50cm / Alpine temperature: High 0C / Moderate south ridge wind / Freezing level up to 1800mMONDAY: Cloudy with isolated flurries / Accumulation: up to 10cm / Alpine temperature: High -2C / Light to moderate southwest ridge wind / Freezing level 1200mTUESDAY: Snow / Accumulation: 10-25cm / Alpine temperature: High -4C / Light to moderate south ridge wind / Freezing level 1000m

Avalanche Summary

Around the Whistler area, recent reverse-loading winds have created small (size 1) wind slabs in alpine lee features which are reactive to skier traffic. On steep sun exposed features in the alpine, solar warming has produced small (size 1) loose snow avalanches over the past few days.

Snowpack Summary

In the alpine, snowpack depths are around 150-200 cm. A variable surface layer consisting of a thin sun crust on solar terrain, surface hoar in sheltered areas, and pockets of wind slab in lee features overlies an upper snowpack of 20-30 cm of low density faceted snow. New snow is not expected to bond well with this surface layer. At bottom of the snowpack, a crust buried at the beginning of November is down 100-120 cm and is unreactive to snowpack tests, in higher elevations it looks to be breaking down. Snowpack depths disappear quickly with decreasing elevation.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.