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Archived

Avalanche Forecast

Jan 21st, 2020–Jan 22nd, 2020
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
1: Low
The avalanche danger rating below treeline will be low

Regions: Cariboos.

Recent fresh snow has been redistributed into pockets of wind slab at tree line and in the alpine. Use caution in wind exposed terrain.

Confidence

Moderate - Uncertainty is due to the fact that persistent slabs are particularly difficult to forecast.

Weather Forecast

TUESDAY NIGHT - Cloudy with clear periods and isolated flurries / southwest wind, 10-30 km/h / alpine low temperature near -8

WEDNESDAY - Cloudy with sunny periods and isolated 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 1500 m

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

Avalanche Summary

Avalanche activity has quieted down over the past few days, but recent snowfall and moderate southerly winds will mean that there will likely be fresh wind slabs, with the most reactive being in exposed terrain in the alpine and at treeline.

There have been no recent reports of persistent slab avalanches.

Snowpack Summary

The south of the region received around 10 to 20 cm of snow over the weekend. The snow was accompanied by moderate southerly winds and relatively warm temperatures, which will mean that the new snow has likely formed wind slabs in the alpine and at treeline.

The main concern over the past couple of weeks has been a layer of surface hoar buried 60 to 120 cm deep. This layer is primarily a concern at treeline and below. It appears to be gaining strength, though test results indicate that there is still the potential to trigger it in isolated areas.

Terrain and Travel

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Approach steep open slopes at and below treeline cautiously, buried surface hoar may exist.

Avalanche Problems

Wind Slabs

Wind slabs may be sensitive to human triggering, especially near ridge crest.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 2

Persistent Slabs

A layer of surface hoar is buried 60 to 120 cm deep. It has not produced any avalanches in the past week. Places where this layer could be triggered include open glades in the trees and shallow snowpack areas.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Unlikely - Possible

Expected Size: 2 - 3.5