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Avalanche Forecast

Archived

Apr 22nd, 2025–Apr 23rd, 2025

Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Below Threshold.
Alpine
Natural avalanches unlikely, human triggered possible.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.
Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Below Threshold.

Regions

Glacier.

Use caution in steep terrain for rider triggered sluffing and lingering storm slabs.

Solar triggered dry loose sluffing is possible with rising freezing levels.

Confidence

High

Avalanche Summary

On Tuesday, riders triggered dry loose sluffing in steep alpine on a east aspect. Natural storm slabs in extreme terrain up to size 2 were observed from Monday afternoon or Tuesday morning.

Soft, surface storm slabs were reactive to ski cuts on steep slopes in the Mt Fidelity area at treeline on Monday. These storm slabs ranged from 10-25cm thick (size 1-1.5) and were running far due to the crusty bed surface.

Snowpack Summary

A lingering storm slab formed by moderate winds exists at treeline and above.

This slab has rapidly bonded to a crust which exists on solar slopes in the alp & on all aspects below 2200m. This Crust will support a skier in most locations and may act as a firm bed surface.

Challenging travel and variable conditions at lower elevations.

Weather Summary

A ridge of high pressure maintains clear skies with rising freezing levels later in the week.

Tonight Clear with cloudy periods. Alp Low: -5 deg C. Wind W 10-20 km/h. Freezing Level (FZL) 1200m.

Wed A mix of sun and cloud. Alp high 0 deg C. Wind Light. FZL 2100m.

Thurs Sunny with cloudy periods. Alp high +4. Wind SE 15 km/h. FZL 2500m.

Fri Sunny with cloudy periods. Alp high +8. Wind SE 10-20 km/h. FZL 2900m.

Terrain and Travel Advice

  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.
  • Closely monitor how the new snow is bonding to the crust.
  • Be alert to conditions that change with elevation and sun exposure.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-slabs that form over a persistent weak layer (surface hoar, depth hoar, or near-surface facets) may be termed Persistent Slabs or may develop into Persistent Slabs.