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Avalanche Forecast

Archived

Apr 8th, 2025–Apr 9th, 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, human triggered possible.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Glacier.

Loose wet avalanches have been easy to trigger on steep slopes at treeline, they’re running far and accumulating mass as they slide.

Good group management will be a great tool for managing this hazard.

Confidence

Moderate

Avalanche Summary

On Tues, a field team was able to easily trigger size 1 storm slabs on steep rolls at tree line and cut cornices triggering up to size 2 loose wet avalanches on steep faces. Loose snow avalanches were accumulating mass in the paths and running far.

A group exiting the Asulkan cabin Mon 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 Sun and Mon in the highway corridor.

Snowpack Summary

5-15cm of new snow at treeline & alpine. Earlier this week temps at treeline were above 0°C for over 48-hours, creating isothermal snow down 50-70cm.

In some locations the new snow has insulated the moist snow below it, preventing a crust from forming. In other locations the late March crust has refrozen creating an excellent sliding surface for the ~30 cm of moist (dry in alpine) snow on top.

Persistent weak layers linger in the mid-snowpack but will likely remain inactive.

Weather Summary

Unsettled conditions continue Wednesday

Tonight cloudy, isolated flurries. Wind SW 20-30 km/h. Freezing Level (FZL) 1500m

Wed Mix of sun/cloud, isolated flurries. Alpine high -3°C. Wind SW 20. FZL 1900m

Thu Flurries (8 cm). Alp high 0. Wind SW 25, gusting 70. FZL 2200m

Fri Cloudy with sunny periods. Alp high -5. Wind SW 20-40. FZL 1500m

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Keep in mind that the high density of wet avalanches can make them destructive.
  • Avalanche activity is unlikely when a thick melt-freeze crust is present on the snow surface.

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.