Avalanche Forecast
Issued: Apr 21st, 2024 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs and Loose Dry.
ahanna,
Avalanche Canada
Watch for wind loaded pockets in leeward features at upper elevations.
Expect loose avalanches when the sun hits fresh snow in steep terrain.
Summary
Confidence
Moderate
Avalanche Summary
A small handful of avalanches were reported in the alpine late last week, including:
a remotely skier-triggered size 2 failing on moist snow below the crust, in which another skier was caught but did not sustain any injury
a skier-controlled size 1 wind slab below an convex roll
a natural size 2 storm slab on a steep, west-facing moraine feature
a cornice failure did not propagate any weak layers on the slope below
Snowpack Summary
Up to 20 cm of new snow sits over a widespread melt-freeze crust on all but high north-facing alpine terrain, where snow is dry and wind affected.
Weather Summary
Sunday night
Up to 5 cm of new snow at upper elevations. 30 to 50 km/h northwest ridgetop wind. Treeline temperature -4 °C. Freezing level 1200 m.
Monday
A mix of sun and cloud. <20 km/h northwest ridgetop wind. Treeline temperature -1 °C. Freezing level 2000m.
Tuesday
A mix of sun and cloud. 10 to 30 km/h southwest ridgetop wind. Treeline temperature +3 °C. Freezing level 2300m.
Wednesday
Sunny. 10 to 30 km/h southwest ridgetop wind. Treeline temperature +4 °C. Freezing level 2400m.
More details can be found in the Mountain Weather Forecast.
Terrain and Travel Advice
- Brief periods of sun could quickly initiate natural avalanche activity.
- Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
- Recent wind has varied in direction so watch for wind slabs on all aspects.
- Pay attention to cornices and give them a wide berth when traveling on or below ridges.
Problems
Wind Slabs
Recent snow and wind have formed fresh wind slabs in lee terrain features at upper elevations. Wind slabs may be especially reactive where they sit over a crust.
Aspects: North, North East, East, South East, North West.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Dry
New snow will be especially sensitive to seeing the sun for the first time.
Aspects: All aspects.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Apr 22nd, 2024 4:00PM
