Avalanche Forecast
Issued: Jan 8th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Cornices and Wind Slabs.
dboucher,
Avalanche Canada
Freezing level rising and temperature warming will increase the avalanche danger thoughout the day. Large cornices may become weak and easy to trigger.
Summary
Confidence
Weather Forecast
The freezing levels will rise significantly to over 2000 metres on Sunday but with no precipitation forecast.
SATURDAY NIGHT: Cloudy with scattered flurries, accumulation 3 to 5 cm, 30 to 50 km/h southwest wind, alpine temperature -7 C with freezing level at valley bottom.
SUNDAY: Cloudy with sunny periods, no precipitation, 20-40 km/h southwest wind, alpine temperature rising to 0 C with freezing level up to 2000 m.
MONDAY: Cloudy with isolated flurries, accumulation 1 to 3 cm, 30-50 km/h southwest wind, alpine temperature -3 C with freezing level around 1000 m.
TUESDAY: Snow, heavy at times, accumulatin 30 to 40 cm, 40-60 km/h south wind, alpine temperature -2 C with freezing level at 1700 m.
Avalanche Summary
Many storm and wind slab avalanches were triggered naturally, by riders, and explosives on Friday. The slabs were generally 30 to 40 cm thick, with the most reactive slabs found in lee terrain features.
Snowpack Summary
New snow in the last few days (20-30 cm) have formed wind slabs in lee terrain features due to strong southerly wind. Storm slabs may still exist in terrain sheltered from the wind. Below about 1200 m in parts of the region close to the coast, the precipitation fell as rain, producing a hard melt-freeze crust. This recent precipitation adds to the 100+ cm of snow that has fallen since January 1, which may overly sugary faceted grains that formed during the cold spell in late December.
Around 150 to 250 cm deep, a weak layer of faceted grains may be found above a melt-freeze crust that formed in early December. The layer is most prominent between 1700 and 2100 m. Observed avalanches on this layer are rather rare and intermittent, suggesting that this layer has become dormant. The most likely place to trigger it would be in thin, rocky snowpack areas.
The lower snowpack is well-settled and strong.
Terrain and Travel
- Cornices become weak with daytime heating.
- Pay attention to cornices and give them a wide berth when traveling on or below ridges.
- Cornice failure may trigger large avalanches.
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
Problems
Cornices
With rising freezing level and temperature warming during the day, large cornices developed with recent snow and wind may become weak and easy to trigger. Also, keep in mind that cornice failure may trigger large avalanches.
Aspects: North, North East, East, North West.
Elevations: Alpine.
Likelihood
Expected Size
Wind Slabs
Wind slabs have formed from recent snow and strong southerly wind. Expect to find them in steep, lee terrain features near ridges.
Aspects: North, North East, East, West, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Jan 9th, 2022 4:00PM
