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Avalanche Forecast

Archived

Mar 12th, 2022–Mar 13th, 2022

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

Regions

Northwest Inland.

Watch for changing conditions as you move through different aspects and elevation bands. Expect reactive wind slabs in wind affected features.

Head to sheltered terrain for the best chance of good riding. 

Confidence

Moderate - Uncertainty is due to how quickly the snowpack will recover and gain strength. The snowpack structure is generally well understood.

Weather Forecast

SATURDAY NIGHT: Mostly cloudy with light and variable winds. Freezing levels reach at valley bottom. 

SUNDAY: A mix of sun and cloud with isolated flurries possible. Light to moderate southerly winds. Freezing levels around 1200 m. Alpine high -1.

MONDAY: Snowfall begins overnight with 5 cm by morning and another 5 cm over the day. Cloudy with moderate to strong southwest winds. Freezing levels around 1200 m. Alpine high of -1.

TUESDAY: Scattered flurries continue with moderate southwest winds. A mix of sun and cloud. Freezing level around 1000 m, alpine high of -2. 

Avalanche Summary

On Friday, fresh wind slabs were reactive to human and natural triggers to size 1.5 in immediate lees from the southwest winds.

Snowpack Summary

10-15 cm of recent snowfall has been redistributed into wind loaded pockets by west-southwest winds. These slabs sit over dense, wind packed snow in most terrain, and likely over a crust on south facing terrain. 

Two spotty layers of surface hoar sit in the upper snowpack. One may exist between the storm snow and old snow surface. The second is buried around 20-40 cm. These layers are more likely to be found in wind sheltered terrain and have not been reactive recently.

The mid-February crust is now buried 40-60 cm deep. Though this layer has not produced recent avalanche activity, small avalanches or large loads may step down to this layer. 

The lower snowpack is well bridged by the mid-February crust, and triggering avalanches below this layer is unlikely at this time. 

Terrain and Travel

  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Wind slabs are most reactive during their formation.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Minimize exposure to sun-exposed slopes when the solar radiation is strong.

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.