Avalanche Forecast

Issued: Feb 25th, 2023 4:00PM

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

Avalanche Canada MW, Avalanche Canada

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Strong - extreme winds and a wee bit of new snow will keep the avalanche hazard elevated Sunday and Monday.

A widespread avalanche cycle along the Icefields Parkway on Tuesday and Wednesday is evidence that the deep persistent problem remains a concern. Natural avalanches have recently stepped down to this layer, and many have been travelling well into below tree line run out zones.

Summary

Confidence

Moderate

Avalanche Summary

No new observations today due to limited visibility. Evidence of a widespread avalanche cycle on all aspects in the alpine was observed on Thursday. Mostly size 2-3 and up to size 4. Many of these avalanches started as wind slabs and stepped down to the deep persistent facet layer. Most notably the main Buck Lake slide path and the Churchill South slide path ran into the ski lines.  

This recent cycle is evidence that we are at or near the tipping point for the deep persistent layer.

Don't forget to post avalanche observations to the MIN.

Snowpack Summary

Recent cold temperatures have faceted the upper snowpack allowing strong- extreme winds to redistribute recent snow. Ridgetop has been scoured in most locations with pockets of wind slab lingering in the alpine and at treeline.

In sheltered locations, 40 cm of settled snow sits on top of a generally weak mid and lower snowpack with facets and depth hoar at the base. The height of snow is variable from 60 to 160cm.

Weather Summary

Sunday

Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: High -10 °C.

Ridge wind southwest: 20 km/h gusting to 45 km/h.

Monday

Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: Low -17 °C, High -14 °C.

Mostly light ridge wind occasionally gusting to 35 km/h.

Tuesday

Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: Low -23 °C, High -14 °C.

Ridge wind east: 10-20 km/h.

Detailed weather forecasts from Avalanche Canada: https://www.avalanche.ca/weather/forecast

Terrain and Travel Advice

  • Expect slab conditions to change drastically as you move into wind exposed terrain.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.

Problems

Wind Slabs

An icon showing Wind Slabs

Strong winds from the SW with some new snow will quickly form more wind slabs in open areas.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood

Likely

Expected Size

1 - 2.5

Deep Persistent Slabs

An icon showing Deep Persistent Slabs

The bottom of the snow pack is inherently weak with well developed Facets and Depth Hoar. Natural avalanches continue to step down to this layer, and many have been travelling well into below tree line run out zones.

Aspects: All aspects.

Elevations: All elevations.

Likelihood

Possible

Expected Size

1.5 - 3.5

Valid until: Feb 26th, 2023 4:00PM

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