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Avalanche Forecast

Archived

Apr 21st, 2026–Apr 22nd, 2026

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

Regions

Glacier.

Colder temperatures will arrive later Wednesday, which will hopefully cool the upper snowpack and freeze-lock the surface mush/slop.

Be prepared for rugged valley-bottom travel, creeks opening up, and variable surface conditions.

Confidence

Moderate

  • We are uncertain about how the timing or intensity of warming will affect the snowpack.

Avalanche Summary

Natural wet loose and wet slab avalanches up to size 2.5 observed in the highway corridor on Monday/Tuesday.

Field team in Connaught creek observed a natural size 2 wet loose avalanche on Sunday AM.

Two reports of skier triggered size 2 slab avalanches on Friday. One from from Quartz creek, and a second on the Thorington.

Snowpack Summary

We are currently experiencing all melt no freeze spring conditions.

~60-80cm of moist surface snow overlies the robust March 21 crust. Strength and structure is diminishing in this upper layer with continued heat, creating a wet slab on a firm bed surface - ideal conditions to see natural wet slabs become active and avalanche.

The mid - lower snowpack is well settled but we expect to see some large avalanches as the warm temperatures permeate the snowpack.

Weather Summary

A cooling trend arrives Wed afternoon, warm until then.

Tonight Cloudy, showers, 10mm. Alp Low 3°C. Freezing level (FZL) 2300m. Ridgetop wind SW 10-25km/h.

Wed Cloudy with sunny periods. High 3 °C. Wind N 20-45km/h. FZL 2400m

Thurs Mix of sun/cloud. Alp High -6°C. Wind N 25-55km/h. FZL 1600m.

Fri Mix of sun/cloud. Alp High -6°C. Wind N 20-35km/h. FZL 1600m.

Terrain and Travel Advice

  • A moist or wet snow surface, pinwheeling, and natural avalanches are all indicators of a weakening snowpack.
  • Avoid travelling on slopes below cornices.
  • Keep in mind that the high density of wet avalanches can make them destructive.

Problems

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.

Wet Slabs

Wet Slab avalanches are the release of a cohesive layer of snow (a slab) that is generally moist or wet when the flow of liquid water weakens the bond between the slab and the surface below (snow or ground). They often occur during prolonged warming events and/or rain-on-snow events. Wet Slabs can be very unpredictable and destructive.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.