Avalanche Forecast

Archived

Nov 26th, 2015–Nov 27th, 2015

Alpine

Below Threshold.

Treeline

Below Threshold.

Below Treeline

Below Threshold.

Alpine

Below Threshold.

Treeline

Below Threshold.

Below Treeline

Below Threshold.

Alpine

Below Threshold.

Treeline

Below Threshold.

Below Treeline

Below Threshold.

Regions

Cariboos.

Rising alpine temperatures up to +5c are in the forecast for the next few days. Use care venturing into big terrain at treeline and above on solar aspects. Consider sharing your observations through the Mountain Information Network MIN

Weather Forecast

An arctic high remains in the forecast region with no precipitation in the forecast for the next 4 days. Strong northerly winds at ridge top are beginning to moderate and will turn to light winds through the weekend. Above freezing temperatures in the alpine are forecast to begin Friday morning and continue into the weekend but valley bottoms will remain well below freezing. At this point no significant change is forecast until Monday or Tuesday next week.

Avalanche Summary

We have no recent reports of avalanche activity in the forecast area, most likely because of few observers at this time.

Snowpack Summary

The most recent storm snow fell on a variety of old surfaces that included crust, surface hoar and old settled snow. Arctic air moving into the region has resulted in northerly winds which have formed small wind slabs on south facing features near ridge top. Warm temps and strong solar input formed a crust on south facing features which can be found underneath Monday's storm snow. There are at least three surface hoar layers in the snowpack buried on: Nov. 5th, Nov. 11th and Nov. 23rd. The first two have been largely unreactive. Facets may exist just above the ground on polar slopes in the alpine.

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.

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.