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Avalanche Forecast

Archived

Jan 21st, 2020–Jan 22nd, 2020

Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

South Columbia.

Storm slabs may be reactive to human triggering, especially in wind loaded areas, and at upper elevations. Watch for signs of instability such as whumphing, cracking and recent avalanches.

Confidence

No Rating -

Weather Forecast

TUESDAY NIGHT - Cloudy with scattered flurries, up to 5 cm / southwest wind, 10-30 km/h / alpine low temperature near -8

WEDNESDAY - Cloudy with scattered flurries / southwest wind, 10-25 km/h / alpine high temperature near -8

THURSDAY - Flurries, 5-10 cm / southwest wind, 25-50 km/h / alpine high temperature near -2 / freezing level 1400 m

FRIDAY - Flurries, 5-10 cm / southwest wind, 20-40 km/h / alpine high temperature near -2 / freezing level 1500 m

Avalanche Summary

There were several reports of natural, explosives, and human triggered avalanches up to size 1.5 on Sunday and Monday.

There were numerous wind and storm slab avalanches up to size 1.5 that were triggered by humans on Saturday. They occurred on all aspects and were generally 10 to 20 cm deep.

Snowpack Summary

Recent strong southerly wind and around 15 to 30 cm of recent snow has formed new storm slabs, with the most reactive slabs being in lee terrain features at higher elevations.

A layer of surface hoar may still be found roughly 80-120 cm deep in the Selkirks and 120-160 cm deep in the Monashees. A facet/crust layer from late November may be found near the bottom of the snowpack.

Terrain and Travel

  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.

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.