Avalanche Forecast

Archived

Dec 9th, 2022–Dec 10th, 2022

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, human triggered possible.

Below Treeline

Natural avalanches unlikely, human triggered possible.

Alpine

Natural avalanches unlikely, human triggered possible.

Treeline

Natural avalanches unlikely, human triggered possible.

Below Treeline

Natural avalanches unlikely, human triggered possible.

Regions

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

Be vigilant regarding the persistent weak layer down 30cm. If the upper snow pack starts to become more cohesive due to warmer temperatures or winds, it could wake up and start producing avalanches.

Confidence

Moderate

Avalanche Summary

No new avalanches were observed.

Snowpack Summary

5-10cm of new snow across the region in the past two days. Moderate south west winds creating wind slabs in the alpine. Tree line and below there is a buried layer down 30-35cm that consists of surface hoar, facets, and sun crust depending on aspect and location. Snow depth ranges from 45-110cm.

Weather Summary

Saturday

Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: High -6 °C.

Ridge wind southwest: 10-25 km/h.

Freezing level at valley bottom.

Sunday

Cloudy with sunny periods and isolated flurries.

Precipitation: Trace.

Alpine temperature: Low -10 °C, High -7 °C.

Ridge wind light to 15 km/h.

Freezing level at valley bottom.

Monday

Cloudy with sunny periods.

Precipitation: Nil.

Alpine temperature: Low -12 °C, High -5 °C.

Light ridge wind.

Freezing level at valley bottom.

Terrain and Travel Advice

Watch for signs of slab formation throughout the day.

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.