Avalanche Forecast
Issued: Jan 19th, 2021 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
dsaly,
Avalanche Canada
Look for pockets of loose snow in sheltered terrain. Dig down and investigate deeper layers before committing to big features.
Summary
Confidence
Moderate - Confidence is due to a stable weather pattern with little change expected.
Weather Forecast
TUESDAY NIGHT- Cloudy with isolated flurries / Southwest wind, 25-45 km/h / Alpine low temperature near -10
WEDNESDAY - Cloudy with sunny breaks / Southwest wind, 20-50 km/h / Alpine high temperature near -7
THURSDAY - Sun and cloud / Northeast wind, 10-15 km/h / Alpine high temperature near -8
FRIDAY - Sunny / Northeast wind, 10 km/h / Alpine high temperature near -11
Avalanche Summary
Last week, there were several natural and persistent slab avalanches between size 2.5-3 reported in the region. Avalanche activity has slowed, and deeper persistent layers are trending towards dormancy. However keep in mind, these avalanches are reminders of the "low probability; high consequence" scenario that persistent slab problems often create.Â
On Wednesday and Thursday (Jan 14-15), explosives triggered numerous avalanches up to size 2.5, including a size 2.5 persistent slab avalanche each day.
Overnight Tuesday and during the day Wednesday (Jan 12-13), a widespread natural avalanche cycle up to size 3 was reported, one of which was a size 2.5 persistent slab avalanche.
Snowpack Summary
A variety of wind affected surfaces covers upper tree line and alpine terrain. A polished crust is found up to 1800 m and higher on solar slopes. Soft pockets of redistributed snow may hide in sheltered areas.
A layers we have been tracking in the snowpack is a layer of weak faceted snow over a hard melt-freeze crust found around 90-200 cm down. Recent sporadic, large, naturally triggered avalanches have occurred on this layer on large alpine slopes and were triggered by either smaller wind slab avalanches, or cornice falls. This layer is trending towards dormancy, however the most likely place to find such conditions would be steep and rocky alpine start zones. The November crust is faceting near the ground. Dig down and investigate the deeper snowpack layers before committing to big terrain.
Terrain and Travel
- Be careful as you transition into wind affected terrain.
- Be alert to conditions that change with elevation, aspect and exposure to wind.
- In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
Problems
Wind Slabs
Winds will move any snow left for transport. Hard wind slabs may be stubborn, however slabs will be dense and firm when triggered. Give cornices their space.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Jan 20th, 2021 4:00PM
