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Avalanche Forecast

Archived

Apr 8th, 2024–Apr 9th, 2024

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.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Lizard-Flathead, South Rockies, Akamina, Flathead, Lizard, Bull, Crowsnest North, Crowsnest South, Elkford East, Elkford West.

Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

Confidence

High

Avalanche Summary

On Sunday skier-triggering and explosive control work initiated several size 1 to 1.5 storm and wind slab avalanches. Numerous size 1 wet loose avalanches occurred on steep solar slopes.

Data is limited in this region. Please consider posting your observations to the Mountain Information Network.

Snowpack Summary

New snow accumulates on a robust crust or moist snow at all elevations except high north-facing.

A second crust in the upper snowpack is down 20 to 40 cm, depending on aspect and elevation.

Weak faceted grains sitting on a crust formed in early February are now buried 100 to 180 cm. This layer has generally been gaining strength and is unlikely to be human-triggered in areas where a supportive crust is present above it.

Weather Summary

Monday Night

Mostly cloudy with flurries, trace to 5 cm of accumulation. Southwest ridgetop wind 20 to 50 km/h. Treeline temperature -4° C. Freezing level 1500 m.

Tuesday

Mostly cloudy with flurries, trace to 5 cm accumulation. Southwest ridgetop winds 30 to 50 km/h. Treeline temperature -3 °C. Freezing level 1800 m.

Wednesday

Mostly Sunny. West ridgetop winds 5 to 15 km/h. Treeline temperature reaches a high of 0 °C. Freezing level rises to 2100 m.

Thursday

A mix of sun and cloud. Southwest ridgetop winds 5 to 15 km/h. Treeline temperature reaches a high of +1 °C. Freezing level rises to 2300 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Fresh wind slabs will likely form throughout the day, diligently watch for changing conditions.
  • Wind slabs may be poorly bonded to the underlying crust.

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.