Issued: Apr 20th, 2023 4:00PM
The alpine rating is Persistent Slabs and Deep Persistent Slabs., the treeline rating is , and the below treeline rating is Known problems include
Moderate avalanche danger means there is still heightened avalanche conditions on specific terrain features and that human triggered avalanches are still possible. If you are going to step out - do so with caution.
On Tuesday several small wind slabs in the alpine were observed. Also one large avalanche stepping down to ground from a falling cornice occurred on Big Bend Peak.
Don't forget to post avalanche observations to the MIN.
Around 15cm of new snow this week sits on crusts on solar aspects, a melt freeze crust below tree line and old wind slab in exposed alpine
Below tree line is in a daily melt-freeze cycle. At tree line the mid-pack consists of multiple layers of sun crusts or facets. Depth hoar and basal facets at the base.
A mix of sun and cloud.
Alpine temperature: High -3 °C.
Ridge wind light to 15 km/h.
Freezing level: 1800m
Cloudy with sunny periods and isolated flurries.
Alpine temperature: Low -7 °C, High -2 °C.
Mostly light ridge wind gusting to 25 km/h.
Freezing level: 2000m
Look for weather products and tutorials at Avalanche Canada.
Terrain and Travel Advice
- Avoid thin areas like rock outcroppings where you're most likely to trigger avalanches failing on deep weak layers.
- In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
Several persistent weak layers in the midpack can be found as facets on polar aspects and sun crusts on solar aspects.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Deep Persistent Slabs
Valid until: Apr 21st, 2023 4:00PM