Northwest Inland Avalanche Forecast

Issued: Dec 22nd, 2021 4:00PM

Thu Dec 23rd Current Conditions
Alpine Moderate Treeline Moderate Below Treeline Low
Fri Dec 24th 2 Day Outlook
Alpine Moderate Treeline Low Below Treeline Low
Sat Dec 25th 3 Day Outlook
Alpine Moderate Treeline Low Below Treeline Low

The alpine rating is moderate, the treeline rating is moderate, and the below treeline rating is low. Known problems include Wind Slabs.

Give the wind slab problem some more time to settle out before committing to larger features. Cold/dry conditions will slowly break down wind slab.

Summary

Confidence

High -

Weather Forecast

Wednesday night: Light to moderate North winds with a Low of -22 at 1600m. No new snow is expected.

Thursday: No new snow expected. Moderate North wind in the morning becoming light North in the afternoon. High of -18 at 1600m.

Friday: light to moderate Northeast winds with no new snow expected. High of -21 at 1600m.

Saturday: moderate winds from the Northeast with no new snow expected. High of -23 at 1600m.

Avalanche Summary

We suspect some natural wind slab avalanches would have taken place on Tuesday.

a few size 2 natural wind slabs were observed in the alpine in the South part of the forecast region on Monday.

Observations are limited. If you are out in the backcountry please consider filling out a Mountain Information Network report.

Snowpack Summary

Westerly aspects are generally scoured but wind slab could exist on some cross loaded features. New wind slab has likely formed on North and East aspects.

The December 15 surface hoar layer is 10 to 20cm below the surface in sheltered treeline and below treeline features. It is likely not a problem yet.

Snowpack depth at treeline typically ranges from 100-200 cm, with higher values in the western part of the region and tapering to the east. In the far southwest of the region, the height of snow is closer to 300 cm. 

Terrain and Travel

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Carefully evaluate steep lines for wind slabs.
  • Avoid freshly wind loaded features, especially near ridge crests, roll-overs and in steep terrain.

Problems

Wind Slabs

An icon showing Wind Slabs

Likelihood

Possible

Expected Size

1 - 2

Wind slab can be found on all aspects. Most west facing terrain is scoured but wind slab could still be found on cross loaded features.

Aspects:

North, North East, East, South East, South.

Elevations:

Alpine, Treeline.

Valid until: Dec 23rd, 2021 4:00PM

Forecast Trend

The latest forecast danger ratings, broken down to elevation. See how an elevation is trending.