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Archived

Avalanche Forecast

Feb 4th, 2021–Feb 5th, 2021
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
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
3: Considerable
The avalanche danger rating at treeline will be considerable
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.

It's another good day for conservative terrain choices. While the likelihood of triggering avalanches is slowly decreasing, the consequences remain high.

Weather Forecast

Expect light snow throughout the day, which may accumulate to 5cm. A cooling trend, with alpine temps in the minus 10 region, and moderate westerly winds. Another 5cm of snow tonight, dribs and drabs of precipitation on Friday; then another 10cm of snow through the weekend. There is general cooling trend as the jet stream has shifted to a NW flow.

Snowpack Summary

An accumulated 60+ cm of storm snow from earlier this week buries Surface Hoar, Crusts, and or Facets depending on elevation and aspect. Storm slabs remain reactive in the Alpine and exposed areas of TL. Persistent slabs are still being triggered yesterday at and below TL. Our mid and lower snowpack is quite strong, with no current concerns. 

Avalanche Summary

2 skier accidentals size 2 slab avalanches were reported yesterday. One in Teddy Bear Trees and the 2nd in Puff Daddy. Both avalanches failed on the January 24th Surface Hoar Layer, and or facets on a crust. A few "Whumphs" were also reported from the backcountry in MIN reports around TL. No new avalanches were obs in the HWY Corridor yesterday.

Confidence

Due to the number of field observations

Avalanche Problems

Persistent Slabs

The January 24th layer which is made up of Surface Hoar, Facets and Crusts (depending on elevation and aspect), is buried 60-80cm below the surface. 3 skier accidentals occurred yesterday on this layer; 2 at Rogers Pass and 1 outside of RMR.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Storm Slabs

Approximately 60cm of recent storm snow, accompanied by warm temps, and strong winds on Tuesday morning built storm slabs in the alpine and exposed areas of Treeline.

  • Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 3