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Archived

Avalanche Forecast

Mar 28th, 2020–Mar 30th, 2020
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
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
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

Regions: Northwest Inland.

This forecast lacks field observations and has lots of uncertainty. This will be the last avalanche forecast of the season. Reactive wind slabs remain the primary concern, especially around ridge features and wind loaded terrain.

Confidence

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

Weather Forecast

Saturday night: Flurries, 5-10 cm. Alpine low temperature -8 C. Moderate to strong southwest wind.

Sunday: Flurries and snow, 5-15 cm. Alpine high temperature -7 C. Moderate southwest wind.

Monday: Cloudy with isolated flurries. Alpine high temperature -11 C. Moderate southeast wind.

Tuesday: Mix of sun and cloud. Alpine high temperature -13 C. Light east wind.

Avalanche Summary

No new avalanche observations were reported this week, this comes from a very limited observation network. 

Snowpack Summary

Around of 10-20 cm of snow has accumulated around the region over the past few days, along with a steady westerly wind. This covers a variety of wind-affected surfaces and a melt freeze crust on south aspects and slopes below 1100 m.

A weak layer of surface hoar crystals buried early March may be found around 30 to 50 cm deep, particularly in sheltered terrain around treeline. Recent observations of this layer are lacking.

An early-season layer of faceted grains and melt-freeze crust near the base of the snowpack likely lingers in high alpine features. The most suspect locations to trigger this layer would be where the snowpack is thin near rocky outcroppings. Large loads, such as cornice fall, may have the potential to trigger it.

Terrain and Travel

  • Watch for avalanche hazard to increase throughout the day.
  • Make conservative terrain choices and avoid overhead hazard.

Avalanche Problems

Wind Slabs

Steady winds continue to impact 10-20 cm new snow around the region. The most reactive deposits tend to be around ridge features and leeward terrain.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Possible - Likely

Expected Size: 1 - 2

Persistent Slabs

A weak layer of surface hoar crystals is buried around 30 to 50 cm in sheltered, shady terrain around treeline. Recent warm conditions have likely promoted bonding of this layer but there is uncertainty about whether it is still a problem.

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

Elevations: Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2