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Archived

Avalanche Forecast

Feb 2nd, 2024–Feb 3rd, 2024
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
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
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

Regions: Bonnington, Crawford, Grohman, Kokanee, Kootenay Boundary, Kootenay Pass, Norns, Retallack, Rossland, Valhalla, Ymir.

The good news...❄️ winter is back! ❄️

The bad news... storm snow may not bond well with the crust.

Dial back your terrain choices as storm snow accumulates this weekend.

Confidence

Moderate

Avalanche Summary

Natural avalanche cycles continued throughout this week with rain, warming, and sunshine weakening the upper snowpack. Wet loose and wet slab avalanches (on the facet layer 30-60 cm deep) were reported to size 2.5. Cooling on Thursday and Friday limited further activity.

Moving forward avalanche activity will become more likely as storm snow accumulates.

Snowpack Summary

Up to 10 cm of storm snow is expected to accumulate over Saturday. This will fall over moist snow at low elevations, or over a crust at higher elevations and may not bond well.

A layer of facets (and small surface hoar in some areas) is buried 30-60 cm deep and a layer of facets on a crust is buried 80-100 cm deep. The cooling trend is expected to strengthen these layers, but we are uncertain how quickly this will happen.

Weather Summary

Friday Night

Cloudy with no new snow expected. Light and variable winds. Freezing levels drop to around 1300 m.

Saturday

Cloudy with up to 10 cm of snow expected over the day. Freezing levels remain around 1500 m, with treeline temperatures around -2 °C. 10-30 km/hr easterly winds.

Sunday

By Sunday morning another 10-20 cm is possible. Freezing levels reach 1500 m again. Treeline temperatures around -2 °C. Southeast winds, 10-20 km/h.

Monday

A mix of sun and cloud with flurries is possible. Freezing levels reach 1500 m over the day. Treeline temperatures around -2 °C. Southeast winds 20-40 km/h.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Wind slabs may be poorly bonded to the underlying crust.
  • Wind slabs are most reactive during their formation.

Avalanche Problems

Wind Slabs

Watch for reactivity in wind affected features. Although Saturday's storm totals will be small, slabs may slide easily on the crust below.

Aspects: North, South East, South, South West, West, North West.

Elevations: Alpine, Treeline.

Likelihood: Possible

Expected Size: 1 - 1.5

Persistent Slabs

The likelihood of avalanches on buried weak layers is decreasing, but we are uncertain how quickly. High-consequence slopes should be approached with caution.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely

Expected Size: 2 - 2.5