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Archived

Avalanche Forecast

Mar 1st, 2025–Mar 2nd, 2025
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
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

Regions: Glacier.

Warm temps and strong solar will make the avalanche problems more reactive.

Avoid South and West facing slopes if the heat from the sun feels strong.

Confidence

Moderate

Avalanche Summary

Natural activity peaked yesterday with many large slab and wet loose avalanches running far. Mountain top freezing levels and strong solar was the trigger.

Snowpack Summary

40cm of heavy storm snow sits on a faceted upper snowpack. Widespread wind effect exists in the alpine from previous SW winds. Yesterday's warming/cooling event has created a widespread surface crust

A weak layer of surface hoar, facets and/or suncrust (Jan 30th) is 50-80cm down. Feb 16 is another PWL(facets/crust/surface hoar) down 30-40cms. Both these layers are reactive to human triggering.

Weather Summary

Building cloudy weather as the ridge of high pressure breaks down.

Tonight Mix cloud & clear. Nil precip. Alp low 0°C. Light ridge winds. Freezing level(FZL) 900m

Sun Cloudy. Alp high 0°C. Ridge wind light. FZL 1800m.

Mon Mix sun/cloud with flurries. 6cm snow. Alp high -3°C. Light wind. FZL 1600m

Tues Mix of sun/cloud. Alp high -6. Light wind. FZL 1500m

Terrain and Travel Advice

  • Avoid steep, sun-exposed slopes when the air temperature is warm or when solar radiation is strong.
  • Keep in mind that human triggering may persist as natural avalanches taper off.

Avalanche Problems

Persistent Slabs

The new snow overlays a buried persistent weak layer (PWL) that consists on suncrust, facets and/or surface hoar in some locations. Warm temps are promoting the settling of a cohesive, reactive slab on top of this layer. Expect this slab to become more reactive during times of intense solar.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1.5 - 2.5

Loose Wet

High freezing levels and rain on snow have all contributed to a weak snowpack at lower elevations. No overnight freeze and direct sun will make this problem more reactive.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Possible - Likely

Expected Size: 1 - 2.5