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Archived

Avalanche Forecast

Feb 29th, 2020–Mar 1st, 2020
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
3: Considerable
The avalanche danger rating below treeline will be considerable
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
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

Weak layers in the upper snowpack are primed for human triggering. Use conservative route selection today!

Weather Forecast

Cloudy with scattered flurries and accumulation of 4 cm. Alpine temperature a high -9 C with ridge wind west: 25 km/h gusting to 50 km/h and freezing level of 1000 metres. For Sunday cloudy with sunny periods and isolated flurries an alpine temperature of -11 C and ridge wind west: 30 km/h and freezing level around 700 metres.

Snowpack Summary

The February 22nd surface hoar (SH) layer lurks below 60cm+/- of storm snow. This layer is present on all aspects and consists of 3-7mm SH. On steep solar the SH sits on top of a 2-4cm sun crust. This layer has been observed to 2450m. No other layers are currently active in the 3.5m snowpack of mostly rounded grains.

Avalanche Summary

A natural avalanche cycle occurred yesterday evening and through the night with slides up to size 3 running to valley bottom. Highway avalanche control produced slides up to size 3 throughout the highway corridor. Numerous reports of skier-triggered avalanches on the February 22nd layer to sz 1.5 this week.

Confidence

Avalanche Problems

Storm Slabs

30cm+ in the last 48hrs has formed fresh storm slab. The storm slab, where triggered, will likely overload the Feb 22nd surface hoar layer. This layer is susceptible to human triggering.

  • The new snow will require several days to settle and stabilize.
  • Use conservative route selection, choose moderate angled and supported terrain with low consequence.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

Feb 22 surface hoar is a persistent weak layer down 50-60cm that overlies a thick crust on solar aspects. This layer has been very active over the last 24hrs. This layer is susceptible to human triggering.

  • Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.
  • Watch for whumpfing, hollow sounds, and shooting cracks.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1 - 3