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Avalanche Forecast

Archived

Dec 14th, 2020–Dec 15th, 2020

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

Regions

Yukon.

The highway to White Pass has re-opened, but due to the long closure, recent observations have come elsewhere, including Atlin, Tushi and Wheaton Valley. As part of your process, be sure to supplement this forecast with your own observations before committing to your line.

Confidence

Moderate - Confidence is due to a stable weather pattern with little change expected.

Weather Forecast

MONDAY NIGHT: Flurries with little accumulation. Moderate southerly winds, becoming light by morning. Alpine temperatures around -13 C.

TUESDAY: Dry but mostly cloudy. Light southeasterly winds. Alpine temperatures around -15 C.

WEDNESDAY: Light snow, 2-4 cm. Light southwesterly winds. Alpine temperatures around -14 C.

THURSDAY: Light snow, 2-4 cm. Light southerly winds. Alpine temperatures around -17 C.

Avalanche Summary

There are no recent reports of avalanches. The most likely place to trigger an avalanche under current conditions is on the downwind side of a steep, exposed ridgeline.

Snowpack Summary

Soft snow can be found in sheltered terrain whereas hardened wind slabs are likely found in the alpine and exposed treeline. Below this surface snow lies a widespread melt-freeze crust. The crust has been reported up to 1400 m in the Wheaton Valley, up to 1800 m near the Alaska border, but was not evident between 1400-1700 m in the Tutshi area. The main concern is newly-formed wind slabs sitting on this crust.

The lower snowpack is generally settled and strong after a massive storm at the beginning of December. However, there is potential for weak snow at the bottom of the snowpack in colder drier areas such as the Wheaton Valley.

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Avoid shallow, rocky areas where the snowpack transitions from thick to thin.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.