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Avalanche Forecast

Archived

Jan 10th, 2022–Jan 11th, 2022

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

Regions

Northwest Inland.

Wind continues to be the main driver of the avalanche danger and new wind slabs are likely touchy in exposed terrain.

Confidence

Moderate - Uncertainty is due to the limited number of field observations.

Weather Forecast

A low pressure system continues to impact the coast but only light amounts of precipitation are expected to push inland into the region. 

Monday Overnight: Snowfall 5-10 cm, moderate to strong SW wind, treeline temperature around -8 °C.

Tuesday: Snowfall 5-10 cm, moderate to strong SW wind, treeline high around -4 °C.

Wednesday: Mainly cloudy with lingering snowfall in the morning 2-4 cm, moderate SW wind, treeline high around -4 °C.

Thursday: A mix of sun and cloud, light to moderate SW wind, treeline high around -6 °C.

Avalanche Summary

On Sunday, a natural wind driven avalanche cycle was reported. Most of the activity was size 1.5-2 with the largest being a size 2.5 which failed on a NE aspect at 1700 m and was 50 cm thick. Most of the activity was reported on north and east aspects but a report from the far south of the region suggests activity on all aspects and elevations. 

Snowpack Summary

30-50 cm of storm snow has typically accumulated over the weekend. Ongoing moderate to strong SW winds will continue to redistribute this new snow into wind slabs in exposed terrain. The recent storm snow overlies a previously wind-affected surfaces comprised of old hard wind slabs, sastrugi, and areas stripped back to the ground or old crusts. Near-surface faceting above the old surface may increase the reactivity of newly formed storm and wind slabs.

The base of the snowpack is composed of crusts and weak faceted grains, particularly in thin snowpack areas. While these layers have generally gone dormant in the region, they still have the possibility of waking up with new snow load or warming, and wind slab avalanches may still have the potential to step down to these deeper layers in isolated areas. 

Terrain and Travel

  • Stay off recently wind loaded slopes until they have had a chance to stabilize.
  • Seek out wind sheltered terrain below treeline where you can avoid wind slabs and find great riding.
  • Watch your sluff: it may run faster and further than you expect.

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.