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Avalanche Forecast

Archived

Apr 20th, 2025–Apr 21st, 2025

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

Regions

Glacier.

New snow overnight and increasing winds on Monday will create a storm slab. Carefully evaluate how the new snow is bonding to the buried crust before stepping into consequential terrain.

Travel at lower elevations is very challenging.

Confidence

Moderate

Avalanche Summary

Few natural avalanches have been observed on the highway corridor over the past few days.

Neighboring operations are reporting small wet loose avalanches on solar facing terrain and natural cornice falls.

Snowpack Summary

5-10cm of new snow overnight on Sun with moderate wind building storm slab. Strom slabs sit over a crust which exists on solar slopes in the alpine & on all aspects below 2200m. This Crust will support a skier in most locations and may act as a firm bed surface.

Alpine N facing slopes may not have a crust effecting ski quality but storm slabs will be deeper & more reactive here due to wind loading.

Challenging travel and variable conditions at lower elevations.

Weather Summary

New snow overnight Sunday with moderate wind.

Tonight Flurries. 11 cm snow. Alp low -6°C. Ridge wind W 15- 30km/hr. Freezing Level (FZL) 1200m.

Mon Cloudy with sunny periods & isolated flurries. Trace precip. Alp high -5°C. West wind 20-40. FZL 1600m.

Tues Sun & cloud. No precip. Alp high -3°C. Wind: NW 10-20. FZL 1800m.

Wed Sunny with cloudy periods. No precip. Alpine high -1. Wind NW 10-20.FZL 2100m.

Terrain and Travel Advice

  • Closely monitor how the new snow is bonding to the crust.
  • Keep in mind a buried crust offers an excellent bed surface for avalanches.
  • Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

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.