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Avalanche Forecast

Archived

Apr 6th, 2025–Apr 7th, 2025

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

Regions

Glacier.

A weak overnight freeze and incoming wet storm will stress the snowpack.

Travel below tree line will be atrocious in isothermal snow.

Confidence

Moderate

Avalanche Summary

A natural avalanche cycle is expected on Monday.

Natural wet loose avalanche activity up to size 2 was observed throughout the highway corridor on Sunday with the most action on solar aspects.

Snowpack Summary

10-15 cm of new snow is expected above 1800m on Mon. Storm snow will sit over a temperature crust which formed everywhere but N aspects in alpine during the warm temps on Sun.

A 10-25cm thick crust from the March 27th rain event is buried 30-50cm deep.

Below 2300m moist snow can be found within the upper / mid snowpack giving the snowpack at lower elevations a drastically different structure

Persistent weak layers linger in the mid snowpack but are not expected to wake up this week

Weather Summary

Rain showers with snow at and above 2000m.

Tonight Cloudy with clear periods. No precipitation. Wind S 25-40 km/h. Freezing Level (FZL) 2200m

Monday Rain & wet snow.12 cm. Alpine high 0 °C. Wind SW15 gusting 40 km/h. FZL 2400m

Tuesday Flurries, Trace precipitation. Alpine high -3 °C. Wind SW 15-30 km/h. FZL 1800m

Wednesday Mainly cloudy with scattered flurries. Up to 5cm. Alpine high -1. Ridge wind SW 15-25. FZL 2000m

Terrain and Travel Advice

  • Storm slab size and sensitivity to triggering will likely increase through the day.
  • The first few hours of rain will likely be the most dangerous period.
  • 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.