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Archived

Avalanche Forecast

Feb 7th, 2021–Feb 8th, 2021
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
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
2: Moderate
The avalanche danger rating below treeline will be moderate
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: Glacier.

Winds have begun to shift north in some locations in the park- keep an eye for reverse loading today.

Weather Forecast

Arctic air is on the way! Temps dipping to -30 C by Wednesday....

Today: A mix of sun and cloud. No precip. Alpine high -17 C. Light NW wind.

Tonight: Mainly cloudy with isolated flurries. Trace of precip. Alpine low -22 C. Light W wind.

Monday: Cloudy with sunny periods. Alpine high -22 C. Light west wind.

Snowpack Summary

Snow from the Feb 2 storm has been redistributed by strong south winds, followed by a switch to northwesterlies in some locations. The Jan 26 persistent weak layer is buried 60-80cm and consists of decomposing surface hoar in sheltered areas and a thin crust on solar aspects. The mid and lower snowpacks are strong, with no current concerns.

Avalanche Summary

Yesterday, field teams were able to trigger small, very soft slab avalanches over a crust on a south aspect at treeline.  Yesterday evening, an isolated natural avalanche cycle occurred on steep, south aspects in the alpine where a switch to northerly winds was seen.

Confidence

Due to the number of field observations

Avalanche Problems

Wind Slabs

A period of reverse loading from northerly winds occurred yesterday evening, adding to the windslab problem created over the past week by moderate to strong south winds.

  • Be cautious as you transition into wind affected terrain.
  • Be careful with reverse loaded pockets of wind slab at ridgeline.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

The Jan 26th layer down 60-80cm is consist of decomposing surface hoar in sheltered areas and a crust on solar aspects. Reactivity appears to be decreasing on this layer, though it remains reactive to human triggers in isolated areas at Treeline.

  • Use caution on open slopes and convex rolls at treeline where buried surface hoar may be preserved.
  • Recent snow may be more sensitive to human triggering on solar aspects where it sits on sun crust

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Possible

Expected Size: 2 - 3