Avalanche Forecast

Archived

Jan 21st, 2024–Jan 22nd, 2024

Alpine

Natural avalanches unlikely, human triggered possible.

Treeline

Natural avalanches unlikely, human triggered possible.

Below Treeline

Natural avalanches unlikely, human triggered possible.

Alpine

Natural avalanches unlikely, human triggered possible.

Treeline

Natural avalanches unlikely.

Below Treeline

Natural avalanches unlikely.

Alpine

Natural avalanches unlikely, human triggered possible.

Treeline

Natural avalanches unlikely.

Below Treeline

Natural avalanches unlikely.

Regions

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

Monday's predicted warmer temperature and 1900m freezing level has the potential transform our surface and midpack into a more reactive slab condition. The support at the bottom of the snowpack is inherently weak. Dig down and test the reactivity of the snowpack before you commit to a line or feature.

Confidence

Low

Avalanche Summary

No field patrol on Saturday or Sunday and nothing new reported. Thursday-Friday, several deep persistent slabs and persistent slab avalanches up to size 2.5 were observed in the alpine.

Snowpack Summary

There is variable wind effect from previous few days of Northerly switching Southerly winds. Down 25cm is a weak layer that is producing results in snow pit tests. The bottom is weak Facets and Depth hoar. Tree line snowpack depth is 45-75cm. The snowpack is weak and largely unsupportive.

Weather Summary

Weather at Parkers ridge on Monday will be cloudy, flurries, -3 °C, light SW winds, and 1900 metres freezing level. Tuesday will be sunny, flurries, and 1600 metres freezing level. Wednesday will be similar but a few degrees cooler.

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

Terrain and Travel Advice

Be carefull around freshly wind loaded features.
Back off if you encounter whumpfing, hollow sounds, or shooting cracks.

Problems

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.

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.