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Avalanche Forecast

Archived

Apr 7th, 2025–Apr 8th, 2025

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

Regions

Glacier.

The upper snowpack at treeline has become isothermal from rain and elevated freezing levels over the past 48 hours.

Wet avalanches will remain likely wherever overnight freeze hasn't created a thick overlying crust.

Take the time to assess the upper snowpack as you travel.

Confidence

Low

Avalanche Summary

A group exiting the Asulkan cabin Monday morning was able to easily trigger wet loose avalanches up to size 1.5 while descending the moraines.

Natural wet loose avalanche cycles, up to size 2, occurred on Sunday from solar warming and again on Monday from rain on snow in steep terrain at treeline and below.

Snowpack Summary

Treeline temps have remained above 0'C for the past 48 hours destabilizing the upper snowpack. As snow/rain continues overnight Monday, there will be uncertainty around the development of bridging crusts at treeline and below.

A 10-25cm thick crust from the March 27th rain event is buried 10-50cm deep

Persistent weak layers linger in the mid snowpack. Wet slabs have potential to fail on the early March crust on Tuesday, lower weak layers will likely remain inactive.

Weather Summary

Rain with snow above 2000m, snowline falling overnight.

Tonight Flurries (7cm). Wind SW 20 km/h gusting 50. Freezing Level (FZL) 1500m

Tue Mainly cloudy, scattered flurries (5cm). Alpine high -3°C. Wind SW 20 gusting 50. FZL 1900m

Wed Sun/cloud, isolated flurries, Trace precipitation. Alp high -5. Wind SW 20-30. FZL 1800m

Thu Sun/cloud, isolated flurries, Trace precip. Alp high 0. Wind SW 15-25. FZL 2000m

Terrain and Travel Advice

  • Keep in mind that the high density of wet avalanches can make them destructive.

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.

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.

Wet Slabs

Wet Slab avalanches are the release of a cohesive layer of snow (a slab) that is generally moist or wet when the flow of liquid water weakens the bond between the slab and the surface below (snow or ground). They often occur during prolonged warming events and/or rain-on-snow events. Wet Slabs can be very unpredictable and destructive.