Avalanche Forecast

Issued: Mar 22nd, 2024 12:45PM

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

Avalanche Canada mkoppang, Avalanche Canada

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Recent snow which is up to 55cm in some places is quickly settling and forming storm slabs. Be sure to evaluate the bond with the new snow and the newly formed March 20th crust. Snow was also moist by 1100am on Friday on solar aspects so pay attention to the solar input and be preparred to adjust you trip based on decreasing stability caused by the sun or warm temperatures.

Summary

Confidence

High

Avalanche Summary

Several loose dry avalanches up to sz 1.5 were observed from steep alpine faces. One new Sz 2 slab was also seen on a SE aspect at treeline failing down 50cm. This slab covered tracks on the common exit from the Tryst Lake area. The slope was steep (>40deg) and a cross loaded feature.

Snowpack Summary

30-60cm of recent low density snow has fallen under the influence of the up slope and convective storms moving through the region. This snow has seen very little affect from the wind but a few storm slabs were noted in treeline wind affected features failing down 50cm. This new snow is overlying the March Temperature crust that is found on all aspects except high pure north alpine areas. So far, the bond with the new snow and the underlying crust is good. Deeper in the snowpack the February 3rd crust still exists but avalanche activity on this layer has decreased since the warm temps last week settling out the snowpack. It is still worth digging and poking down to evaluate this layer. On Friday, when the sun came out it rapidly settled the new snow making it moist within the top 15cm. As it refreezes, lower elevation terrain as well as solar aspects are likely to have a temperature crust.

Weather Summary

Light snow is forecast to continue with accumulations around 5cm. Winds will continue to be light out of the NW and skies will generally be a mix of sun and cloud. Temperatures will be -12C overnight warming up to -8C by midday.

Be aware that when the sun does come out it packs a punch at this time of year and quickly snow stability will deteriorate on the solar aspects. Thin cloud can also lead to a "Greenhouse effect" that can also make the upper snowpack moist and unstable. Lots going on in Spring!

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Conditions may have improved, but be mindful that deep instabilities are still present.
  • Fresh wind slabs will likely form throughout the day, diligently watch for changing conditions.
  • The more the snowpack warms-up and weakens, the more conservative you`ll want to be with your terrain selection.

Problems

Wind Slabs

An icon showing Wind Slabs

Variable wind directions will put slabs on all aspects, and primarily in immediate lee areas. These include settlement or storm slabs.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 2

Persistent Slabs

An icon showing Persistent Slabs

This layer is the Feb 2 crust. More prominent on polar aspects.

Aspects: North, North East, East, West, North West.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

1.5 - 3

Deep Persistent Slabs

An icon showing Deep Persistent Slabs

Facets near the base of the snowpack may be trigerred from thin areas. Low probability high consequence avalanches should be in your mind.

Aspects: North, North East, East, West, North West.

Elevations: Alpine, Treeline.

Likelihood

Unlikely - Possible

Expected Size

1.5 - 3

Valid until: Mar 23rd, 2024 3:00PM

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