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Avalanche Forecast

Archived

Mar 28th, 2025–Mar 29th, 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 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.

Regions

Glacier.

The snowpack had a poor recovery from the recent rain event. Make conservative decisions and avoid overhead hazards while the snowpack heals.

Confidence

Moderate

Avalanche Summary

A rain event into the alpine caused a widespread natural avalanche cycle on Wed. Numerous large wet avalanches ran down into the valley bottom.

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

Neighboring regions have reported serious incidents and very large avalanches.

Snowpack Summary

A few cm's of moist snow sits on a saturated snowpack where 30mm of rain percolated down 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.

The March 5 PWL consists of a crust &/or surface hoar and is down 60-120cm. There is concern that wet avalanches will step down to this PWL and entrain snow at lower elevations.

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

Weather Summary

Bands of light precip with a clearing trend starting Sunday.

Tonight: Trace precip. Alpine low -5°C. SW wind 20km/hr. Freezing Level (FZL) 1600m

Sat: Cloudy w/ sunny periods & isolated. 4cm. Alpine high -4°C. West wind 15-25km/hr. FZL 1900m

Sun: Mix of sun & cloud. Trace precip. Alpine High -2°C. SE wind 10km/hr. FZL 2000m

Mon: Mix of sun & cloud. Trace precip. Alpine High 0°C. SE wind 10-20km/hr. FZL 2000m

Terrain and Travel Advice

  • 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

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.

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.