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Avalanche Forecast

Archived

Dec 10th, 2019–Dec 11th, 2019

Alpine
Natural avalanches unlikely.
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.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Inland.

A light dusting of new snow won't be enough to elevate avalanche danger on Wednesday.

Confidence

High - Confidence is due to a stable weather pattern with little change expected.

Weather Forecast

TUESDAY NIGHT: Cloudy with isolated flurries bringing 1-3 cm of snow, 30 km/h wind from the west, alpine temperatures drop to -8 C.

WEDNESDAY: Scattered flurries with up to 5 cm of new snow, 30-40 km/h wind from the south, alpine high temperatures around -6 C.

THURSDAY: Scattered flurries with 5-10 cm of snow, 40 km/h wind from the south, alpine high temperatures around -6 C.

FRIDAY: Cloudy with isolated flurries and clearing in the afternoon, 30 km/h wind from the west, alpine high temperatures around -6 C.

Avalanche Summary

Recent MIN reports suggest there has been minimal avalanche activity over the past week. No significant activity is expected until the next major snowfall.

Snowpack Summary

MIN reports from the weekend describe extensive wind affect at higher elevations, while softer snow can be found in sheltered terrain. Warm inversion temperatures have likely left a thin surface crust on south-facing slopes in the alpine. Recent wind from the southwest and north has left hard wind slabs near ridgetops and lee terrain. In isolated areas, these small slabs may be sitting on sugary faceted snow or feathery surface hoar, which could make them reactive to human triggering. Snowpack depths are 50-100 cm in alpine areas around Smithers, with depths diminishing rapidly below 1500 m.

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.