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Avalanche Forecast

Archived

Apr 1st, 2025–Apr 2nd, 2025

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

Regions

Glacier.

Early spring conditions call for careful evaluation of the snowpack throughout the day

Be mindful of overnight refreeze and how quickly it breaks down.

Confidence

Moderate

Avalanche Summary

Small loose wet cycle on steep sunny slopes Monday including one natural size 3.0 over a snowshed.

The March 27th crust has added strength to the snowpack but expect natural activity to pick back up during sunny periods or if freezing levels are higher than forecast.

A rain event caused a widespread natural avalanche cycle on Wed. Numerous very large wet avalanches ran down into the valley bottom. These avalanches included the deeply buried January Facets.

Snowpack Summary

10-20cm of surface snow is dry powder on northerly aspects in the alpine. On solar aspects there is a surface crust with up to 5cm new snow on top.

Surface snow sits on a 10-25cm thick crust of variable strength formed by the rain event March 25th. Field teams reported moderate compression test results within this crust.

Below 2300m moist snow can be found under this crust. If the March 27th persistent slab is triggered, it may entrain large wet loose avalanches.

Weather Summary

Unsettled conditions continue Wed

Tonight cloudy with clear periods, isolated flurries. Freezing Level (FZL) 1400m

Wed Cloudy with sunny periods. Alpine high -6°C. Wind W 20 km/h. FZL 1500m

Thurs Mix of sun and cloud, isolated flurries. Trace precip. Alpine high -6. Wind N 15. FZL 1600m

Fri Sunny with cloudy periods. Alpine high -4 °C. Light wind. FZL 1900m

Terrain and Travel Advice

  • Back off slopes as the surface becomes moist or wet with rising temperatures.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.
  • Overhead hazard may not be obvious; evaluate prior to commiting to terrain.

Problems

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.