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

Regions

North Rockies, Sugarbowl, East Kakwa, Kakwa, McGregor, Pine Pass, Tumbler.

Wet loose avalanches remain likely after sustained warmth and sun. The snowpack needs time to cool and recover.

New and reactive wind slabs are forming in the alpine on north aspect terrain.

Confidence

Moderate

Avalanche Summary

On Thursday, a few natural and rider-triggered triggered size 1-2 wind slabs were reported on southerly aspects in the alpine.

NOTE: Observations in this region are currently very limited.

Snowpack Summary

New snowfall of up to 10 cm overlies primarily moist surface conditions. Solar aspects and lower elevations will begin to develop a crust or still present as moist snow.

Below this, a 5 to 25 cm variable strength crust from last week's rain event is present. This is capping a moist upper snowpack.

A persistent weak layer from early March, 40 to 80 cm deep, most likely exists as surface hoar on sheltered north and east aspects in the alpine. Its distribution is variable, and there have been no substantial reports of recent avalanches, but it should still be considered when evaluating slopes.

Weather Summary

Sunday Night

Cloudy, 5 to 10 cm of new snow. 30 to 60 km/h southwest ridgetop wind. Treeline temperature +5 °C. Freezing level falling to 1500 m.

Monday

Cloudy, 1 to 5 cm of new snow. 30 to 60 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 1500 m.

Tuesday

Cloudy, 5 to 10 cm of new snow. 30 to 60 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 1700 m.

Wednesday

Cloudy, 30 to 60 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 1500 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid travelling on slopes below cornices.
  • The more the snowpack warms up and weakens, the more conservative your terrain selection should be.
  • Be careful as you transition into wind-affected terrain.

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.

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.

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.