Dashboard Regions Weather Stations Radar Alerts Glossary
Contact About
Log In

Register for an account and never miss a forecast again!

Register

Avalanche Forecast

Archived

Nov 28th, 2021–Nov 29th, 2021

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

South Coast Inland.

 Please respect all restrictions on BC highways. 

Recent snowfalls at higher elevations have developped storm slabs that could trigger deeper weak layers and produce large avalanches.

Confidence

Low - Uncertainty is due to limitations in the field data.

Weather Forecast

 A weak ridge of high pressure will bring a break between storms with mainly quiet conditions for Monday. 

Sunday night: Moderate rain or flurries; 5-10 cm. Moderate to strong southwest winds. Alpine low temperatures -3 C with freezing levels going down to 1600 metres.

Monday: Mainly cloudy with isolated flurries. Moderate southwest winds. Alpine high temperatures -2 C with freezing levels steady at 1700 metres.

Tuesday: Periods of snow; 5-10 cm. Strong southwest winds. Alpine high temperatures -2 C with freezing levels at 1700 metres.

Wednesday: Wet snow mixed with rain; 10-20 mm. Strong southwest winds. Alpine high temperatures +2 C with freezing levels up to 1700 metres in the north of the region and 2800 metres in the south of the region.

Avalanche Summary

Large avalanches sliding on recently buried surface hoar and deeper buried crusts have been observed in the region as well as in the neighboring Sea to Sky.

Reports in the region remain limited. Be sure to post your observations to the Mountain Information Network !

Snowpack Summary

With freezing levels going down overnight, a crust will develop at the surface at treeline and will be covered by 5-10 cm of new snow. In the high alpine, thick storm slabs are likely to be found in lee terrain features.

Recent snowfalls sit over a layer of surface hoar or crust down 60-90 cm that produced avalanche activity in neighboring Sea to Sky region. Deeper in the snowpack, a hard rain crust sits around 70-110 cm below the surface, or shallower on windward slopes. Another rain crust exists near the bottom of the snowpack.

Average snowpack depths in the alpine are now 130-180 cm. Below treeline, depths of 30-50 cm have been reported around 500 m, decreasing dramatically with elevation, and still below threshold for avalanching in many areas.

Early season hazards such as rocks, stumps, and creeks are a concern below the alpine.

Terrain and Travel

  • In times of uncertainty conservative terrain choices are our best defense.
  • Be mindful that deep instabilities are still present and have produced recent large avalanches.
  • If triggered, storm slabs in-motion may step down to deeper layers and result in very large avalanches.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.