Avalanche Forecast

Archived

Mar 26th, 2024–Mar 27th, 2024

Alpine

Natural avalanches unlikely, human triggered possible.

Treeline

Natural avalanches unlikely.

Below Treeline

Natural avalanches unlikely.

Alpine

Natural avalanches possible, human triggered probable.

Treeline

Natural avalanches unlikely, human triggered possible.

Below Treeline

Natural avalanches unlikely.

Alpine

Natural avalanches unlikely, human triggered possible.

Treeline

Natural avalanches unlikely, human triggered possible.

Below Treeline

Natural avalanches unlikely.

Regions

Jasper, Brazeau, Churchill, Cirrus-Wilson, Fryatt, Icefields, Maligne, Marmot, Miette Lake, Pyramid.

Recent skier remote avalanches are a good reminder that avalanches are still possible. Watch for the wind to pick-up from the south on Wednesday.

Confidence

Moderate

Avalanche Summary

A group of 7 skiers on Sunday at Icefield's Boundary peak area remote triggered a size 2 slab from 100m away. The avalanche occurred in a thin rocky spot, alpine, N aspect, 2250m elevation, 35 degree slope, and slid on the Feb 3rd layer. The group triggered it from the bench above.

Likewise groups have been remote triggering avalanches around the Lake Louise zone up to size 3. These have been failing on the the Feb 3rd layer.

Snowpack Summary

A thin sun crust is present on steep solar slopes at all elevations. Elsewhere has about 10cm of soft snow on top of a 2-10cm melt freeze crust. The Feb 3rd crust interface is down 30-90cm. Basal depth hoar and facets make up the bottom of the snowpack. HS ranges from 50 to 150cm.

Weather Summary

Mountain Weather Forecast is available @ Avalanche Canada https://avalanche.ca/weather/forecast

Wednesday

Mainly cloudy with isolated flurries.

Precipitation: Trace.

Alpine temperature: High -4 °C.

Ridge wind southwest: 15-35 km/h.

Freezing level: 1700m

Thursday

Flurries.

Accumulation: 8 cm.

Alpine temperature: Low -8 °C, High -4 °C.

Ridge wind southwest: 10-25 km/h.

Freezing level: 1700m

Terrain and Travel Advice

Even a small avalanche can be harmful if it pushes you into an obstacle or a terrain trap.
Avoid steep slopes when air temperatures are warm, or solar radiation is strong.

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.