Avalanche Forecast

Issued: Apr 4th, 2023 3:30PM

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

Avalanche Canada JMackenzie, Avalanche Canada


Pay close attention to the effects of the warm April sun. Avoid exposure to solar aspects later in the day.




Avalanche Summary

Nothing new was reported or observed today.

Snowpack Summary

Despite the relatively cool temperatures, the snowpack is settling slowly. Recent snowfalls remain dry and largely not effected by wind on polar aspects. On the solar side, surface conditions are turning moist and then re-freezing overnight. However, the snowpack has not yet transitioned to a true "spring" snowpack. Several persistent weak layers remain in the upper and mid snowpack down anywhere from 20 to 80cm. It's worth taking the time to dig down and explore these interfaces as they are highly variable depending on aspect and elevation. Slab avalanches on these interfaces are still possible. And of course, our friendly neighbourhood facet / depth hoar basal layers are still here. These are of more concern in steep, shallow and/or rocky terrain where full-depth avalanches are possible. The strength of the April sun is a factor in "waking up" this deep instability.

Weather Summary

Wednesday will be a mix of sun and cloud with light westerly winds. No snow is expected and temperatures will climb to -5C at ridgetop. The April sun will pack a punch!

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • In areas where deep persistent slabs may exist, avoid shallow or variable depth snowpacks and unsupported terrain features.
  • Minimize exposure to sun-exposed slopes when the solar radiation is strong.


Deep Persistent Slabs

An icon showing Deep Persistent Slabs

Thin, shallow areas or heavy triggers (such as cornices) are what will set this layer off. Avoid terrain with those characteristics. Intense solar radiation and daytime heating may wake up this layer.

Aspects: All aspects.

Elevations: Alpine, Treeline.


Unlikely - Possible

Expected Size

2 - 3.5

Persistent Slabs

An icon showing Persistent Slabs

There are two layers of concern here: 1) a buried sun crust (on solar) and facets (on polar) down 20-40cm, and 2) a facet/depth hoar layer down 80-100cm that was buried mid season. The sensitivity of these layers is highly variable so take the time to dig down and evaluate the snowpack. These avalanche problems are more prone to triggering during periods of intense solar radiation.

Aspects: All aspects.

Elevations: Alpine, Treeline.



Expected Size

1.5 - 2.5

Valid until: Apr 5th, 2023 4:00PM