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Avalanche Forecast

Archived

Apr 15th, 2025–Apr 16th, 2025

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

Regions

Glacier.

Get up and complete your mission early before the heat of the day destabilizes the snowpack.

The sun keeps getting stronger as we creep towards summer. It can rapidly turn a solid crust into moist mush in less than an hour!

High elevation, N-facing slopes hold dry snow and a "sneaky" surface hoar problem. Watch for slabs up there.

Confidence

High

Avalanche Summary

On Apr 14, a party up Loop Brook saw several sz 2 wet/loose avalanches from steep, S-facing terrain on Mt Green, while a field team on the Youngs traverse saw no natural activity.

On Friday, a skier triggered a sz 2 wind slab on the Dome glacier at 2450 m on a NE aspect. This avalanche likely failed on a layer of surface hoar down 15-40 cm

A wide-propagating(~500m) sz 2.5 was also triggered by skiers Friday on the Bruins Glacier, heading towards the col between Ursus Major and Pk 8812.

Snowpack Summary

Daily melt/freeze cycles are affecting the surface of the snowpack on solar slopes and all aspects BTL, with several crusts of variable strength in the upper snowpack. High alpine, north facing slopes still hold dry snow. A buried surface hoar layer exists down 15-40cm in sheltered north alpine areas above ~2300m. This layer is reactive to human triggering.

Below treeline, conditions are variable and challenging travel exists.

Weather Summary

Sun, gusty winds, and warm by Fri, then a series of storms starting Sat

Tonight Clearing. Alp low -7°C. Ridge wind NW 20-40km/h. Freezing Level (FZL) 900m

Wed Mix sun & cloud. Alp high -4°C. Wind N 25-45km/h. FZL 1800m

Thurs Sun. Alp high -3°C. Ridge wind N 15-40km/h. FZL 1900m

Fri Sun & cloud. Alp high 1°C. Ridge wind W 10km/h. FZL 2200m

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.
  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.