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Archived

Avalanche Forecast

Feb 23rd, 2021–Feb 24th, 2021
Alpine
4: High
The avalanche danger rating in the alpine will be high
Treeline
4: High
The avalanche danger rating at treeline will be high
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
4: High
The avalanche danger rating in the alpine will be high
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

Regions: Glacier.

Pay attention to overhead avalanche paths!!

80cm in 3 days, strong to extreme winds, and mild temps have created a reactive storm slab.

Numerous avalanches detected overnight indicate the danger level at higher elevations is still high.

Weather Forecast

Unsettled wx for the next couple of days, followed by a Thurs storm.

Today: Cloudy with sun and isolated flurries, trace amounts, Alp high -12*C, mod W winds

Wed: Cloudy with sun and isolated flurries, trace amounts, Alp high -12*C, mod W winds

Thurs: Snow, 20cm, Alp high -9*C, strong SW winds

Snowpack Summary

80mm of precip in the last 3 days, extreme S'ly winds, and mild temps have created a widespread surface storm slab. Thickness of the new slab will vary from 50-100cm. This sits on the Feb 14 drought interface, which is predominantly a wind crust in exposed areas near the height of the pass, and buried windslabs and facets as you move East and West.

Avalanche Summary

Numerous sz 3 to 4 artillery-controlled avalanches were observed yesterday, and a continuing natural avalanche cycle overnight to sz 3.5 has kept the valleys filled with a rumbling sound. 23 avalanches were registered by remote sensors last night, indicating the mountains are still shedding even with the cooler temps.

Confidence

Due to the number of field observations

Avalanche Problems

Storm Slabs

80+cm of storm snow is being redistributed by mod/strong S'ly winds. This lies on top of the Valentine's Day weak interface of facets, crusts and variable wind effect. Slab properties have developed and are failing on this layer.

  • Avoid exposure to avalanche terrain, large avalanches may reach the end of run out zones.
  • The new snow will require several days to settle and stabilize.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely - Very Likely

Expected Size: 1.5 - 3.5

Loose Dry

A bonus 25-30cm of cooler snow fell last night. This will readily sluff in steep terrain and could be a real hazard if it pushes you into a terrain trap, resulting in a deep burial.

  • If triggered dry loose point releases can form deeper deposits in terrain traps.

Aspects: All aspects.

Elevations: Treeline, Below Treeline.

Likelihood: Likely

Expected Size: 1 - 2.5