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Archived

Avalanche Forecast

Dec 29th, 2024–Dec 30th, 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
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold
Alpine
1: Low
The avalanche danger rating in the alpine will be low
Treeline
1: Low
The avalanche danger rating at treeline will be low
Below Treeline
Below Threshold
The avalanche danger rating below treeline will be below threshold

Regions: Tutshi, Wheaton, White Pass East, White Pass West, Yukon.

Watch for pockets of fresh wind slab on atypical aspects and elevations due to outflow winds.

Confidence

Moderate

Avalanche Summary

No new avalanches have been reported in the region. Observations have been limited, but our field team got a glimpse into treeline terrain Thursday and Friday with no avalanche activity to report.

If you head out in the mountains, please consider sharing your observations on the Mountain Information Network.

Snowpack Summary

Any trace of soft snow available for transport in the extensively wind-hardened landscape will be reverse-loaded into atypical terrain features as outflows pick up this week.

20 to 30 cm of wind-battered snow sits over a crust. A recent MIN report describes preserved surface hoar sitting above the crust in the Powder Valley. This setup is worth investigating throughout the region as slabs formed over this grain could remain reactive for an extended period.

Despite the presence of faceted grains in the lower snowpack, there are no layers of concern below the crust. Snowpack depths range from about 70 to 180 cm.

Weather Summary

Sunday night

Partly cloudy. 20 to 40 km/h northeast outflow winds. Treeline temperature -14 °C.

Monday

A mix of sun and cloud. 20 to 40 km/h northeast outflow winds. Treeline temperature -13 °C.

Tuesday

A mix of sun and cloud. 30 to 40 km/h east ridgetop wind. Treeline temperature -15 °C.

Wednesday

Sunny. 40 to 50 km/h east ridgetop wind. Treeline temperature -20 °C.

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.
  • Keep your guard up at all elevations. Wind slab formation has been extensive and could extend into openings below treeline.
  • Recent wind has varied in direction, so watch for wind slabs on all aspects.

Avalanche Problems

Wind Slabs

Watch for wind slabs in atypical terrain features (think southwest aspects instead of northeast). This pattern is most likely to be found at lower elevations with soft snow available for transport by outflow winds.

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

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 1.5