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Archived

Avalanche Forecast

Mar 29th, 2025–Mar 30th, 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
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
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Glacier.

There has yet to be significant recovery (crust formation) in the saturated snowpack after the recent rain event.

Strong solar input tomorrow may quickly destabilize slopes again. Minimize your exposure to overhead hazard.

Confidence

Moderate

Avalanche Summary

A rain event into the alpine caused a widespread natural avalanche cycle on Wednesday. Numerous very large (up to size 4.0) wet avalanches ran down into the valley bottom. These avalanches included the deeply buried January Facets.

Since then, natural activity has slowed down but human triggering remains a concern.

Snowpack Summary

10-15cm's of new snow sits on a saturated snowpack, where 40mm of rain percolated down over 70cm. How well the wet snow will recover with weak overnight freezing is uncertain.

Due to the rain event, we have lost 37cm in the total height of snow at 1900m. Rain runnels are visible high into the alpine.

The March 5 PWL consists of a crust &/or surface hoar and is down 60-120cm.

Additional PWL's from Jan/Feb are now buried 140-190cm deep

Weather Summary

Brief drying trend Sunday. Instability returns Monday, bringing cloudy skies and convective flurries.

Tonight: Mainly cloudy. Alpine low -5°C. SW wind 20km/hr. Freezing Level (FZL) 700m

Sun: Mix of sun & cloud. Alpine High 0°C. East wind 15-25km/hr. FZL 2000m

Mon: Mainly cloudy. Trace precip. Alpine High -1°C. SE wind 10km/hr. FZL 1900m

Tues: Mainly cloudy. Trace precip. Alpine high -3°C. FZL 1800m.

Terrain and Travel Advice

  • Limit exposure to steep, sun exposed slopes, especially when the solar radiation is strong.
  • Triggering deep layers is more likely if the snow surface didn't freeze overnight.
  • Wet avalanche activity may step down to deeply buried persistent weak layers at lower elevations.

Avalanche Problems

Loose Wet

Strong solar is forecast for tomorrow. Expect freshly fallen snow to be easily triggered as a loose wet avalanche, which may gain significant mass with this moisture-laden snowpack.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 3

Storm Slabs

10-15cm in the past day has accumulated in the alpine & at treeline with moderate wind transport from the SW. Use caution in leeward terrain features.

Aspects: All aspects.

Elevations: Alpine, Treeline.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

A persistent weak layer (PWL), buried March 5th, is down 60-120cm. Depending on aspect and elevation, this layer may be suncrust, facets &/or surface hoar.

There is concern that wet avalanches will step down to this PWL (or lower) and entrain a significant mass of moist-wet snow.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Unlikely

Expected Size: 2.5 - 4