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Avalanche Forecast

Archived

Apr 24th, 2022–Apr 25th, 2022

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.
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

North Rockies.

Carefully assess the wind slab hazard as you gain elevation. New wind slabs could form throughout the day.

Confidence

Moderate - The snowpack structure is generally well understood.

Weather Forecast

Sunday night: up to 5 cm of new snow expected at higher elevations. Moderate to strong south winds and freezing level falling to 1500 m.

Monday: 5 to 10 cm of new snow expected at higher elevations with moderate southerly winds. Freezing level rising to 2100 m.

Tuesday: A mix of sun and cloud with the possibility of flurries bringing up to 5 cm of new snow at higher elevations. Light variable winds and freezing levels around 2000 m.

Wednesday: Stormy with 5 to 15 cm of new snow expected at higher elevations. Moderate northwest winds and freezing levels around 1700 m.

Avalanche Summary

Natural wet loose avalanches up to size two have been observed throughout the region over the past few days. Information is limited at this time of year. Please consider submitting to the Mountain Information Network!

We suspect that that new wind slabs could form in exposed terrain on Monday. As the freezing level rises small wet loose avalanches are possible.

Snowpack Summary

New wind slab will likely form on northerly aspects The upper snowpack contains several crusts that extend to mountain top on solar aspects. Moist snow will likely be observed at lower elevation terrain.

The snowpack below treeline is thinning quickly.

Cornices are very large and exposure to slopes beneath them should be minimized, especially if the weather is sunny, warm, or windy. 

Terrain and Travel

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Minimize your exposure time below cornices.
  • Back off slopes as the surface becomes moist or wet with rising temperatures.

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.