Avalanche Forecast
Issued: Jan 29th, 2022 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Storm Slabs.
wlewis,
Avalanche Canada
Avoid avalanche terrain, natural avalanche activity is expected on Sunday with continuous heavy precipitation.
Touchy storm slabs will form over a variety of weak surfaces - smooth crusts, delicate surface hoar and weak facetted snow.
Summary
Confidence
Weather Forecast
A front stalls across the coast Saturday night, bringing moderate snowfall and wind before moving on Sunday afternoon.
SATURDAY NIGHT: Cloudy, with moderate southwest winds. Snowfall begins overnight, bringing 10-25 cm by morning. Freezing levels at 800 m.
SUNDAY: Snow continues, 20-50 cm by Sunday afternoon. Freezing levels remain below 1000 m. Winds remain strong from the southwest. Alpine high -3.
MONDAY: Possible flurries with mostly cloudy skies. Moderate westerly winds. Alpine high of -4. Freezing levels sit below 800 m.
TUESDAY: A mix of sun and cloud. Moderate northerly winds. Freezing levels 500 m. Alpine high -6.
Avalanche Summary
Widespread natural activity is expected as a result of the heavy precipitation forecast for Sunday.
Explosive control work near Whistler on Tuesday produced a cornice fall that triggered a size 2.5 deep persistent slab on the weak facetted crystals above the early December crust. The slab was 60-130cm deep. This indicates that while the weak layer is unlikely to be affected by skiers and riders, it is still triggerable by very large loads.
Snowpack Summary
Storm snow sits over a thick melt freeze crust sits on the surface on all aspects up to approximately 2200 m. Surface hoar is reportedly sitting above the crust, expect increased reactivity of storm slabs in sheltered and shaded areas at treeline and below.
At higher elevations storm snow will sit over dry snow on shaded north facing aspects, and a thin melt freeze crust on sunny southern aspects.
The early December crust/facet layer can be found around 100-200 cm deep, most prominent between 1700 and 2100 m. This layer showed no reactivity from the warming event last weekend and is currently classified as dormant. Large loads may still be able to trigger avalanches on this layer.
Terrain and Travel
- Avoid all avalanche terrain during periods of heavy loading from new snow and wind.
- Be aware of the potential for larger than expected storm slabs due to the presence of buried surface hoar.
Problems
Storm Slabs
Storm snow will fall on a smooth crust. In sheltered areas at treeline and below, a weak and reactive surface hoar layer sits above the crust - increasing likelihood of natural and human triggered avalanches.
Travel in avalanche terrain is not recommended.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Jan 30th, 2022 4:00PM
