Avalanche Forecast

Issued: Apr 20th, 2023 4:00PM

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is below threshold. Known problems include Persistent Slabs and Deep Persistent Slabs.

Avalanche Canada TJ, Avalanche Canada


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.




Avalanche Summary

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.

Snowpack Summary

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.

Weather Summary


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.

Precipitation: Trace.

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.


Persistent Slabs

An icon showing Persistent Slabs

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.



Expected Size

1.5 - 3

Deep Persistent Slabs

An icon showing Deep Persistent Slabs

The bottom of the snowpack is inherently weak with well-developed Facets and Depth Hoar.

Aspects: All aspects.

Elevations: Alpine, Treeline.



Expected Size

2 - 4

Valid until: Apr 21st, 2023 4:00PM