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Avalanche Forecast

Archived

Apr 9th, 2025–Apr 10th, 2025

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

Regions

Glacier.

In the Spring, cold temps lock up the snowpack, making travel fast and lowering danger levels. Warm temps do the opposite, causing the mountains to shed their winter coats.

With this in mind, get up early, hustle to finish your objective, and enjoy the afternoon heat from your patio. If it's too hot, back off until another day.

Confidence

Moderate

Avalanche Summary

On Tues, a field team was able to easily trigger size 1 storm slabs on steep rolls at Treeline 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

The upper snowpack constantly changes in the Spring. Dry to moist (elevation dependent) snow is sandwiched by multiple melt-freeze crusts. High Alpine, polar-facing slopes hold cold, dry snow, while S'ly slopes warm up daily, creating another crust for snow to fall upon.

Wind slab is evident in immediate lee features, both at ridgecrest and along crossloaded slopes, Treeline and above.

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

Weather Summary

Convective flurries and gusty winds continue across the region.

Tonight cloudy, clear periods. Alp low -4°C. Ridge wind S 20km/h. Freezing Level (FZL) 1200m.

Thu Wet flurries, 10cm. Alp high 4°C. Ridge wind SW 25, gusting 75km/h. FZL 2600m.

Fri Clouds with sun, isolated flurries. Alp high -3°C. Ridge wind SW 25-65. FZL 1600m.

Sat Sun, cloud, and flurries. Alp high -6°C. Ridge wind W 20-40km/h. FZL 1400m.

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

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.