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Avalanche Forecast

Archived

Mar 29th, 2025–Mar 30th, 2025

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

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.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.