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Avalanche Forecast

Archived

Apr 24th, 2022–Apr 25th, 2022

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

Regions

Sea To Sky.

New snow could create dangerous avalanche conditions at higher elevations on Monday, be especially careful in wind-affected terrain.

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

SUNDAY NIGHT: Cloudy with flurries brining 15-25 cm of snow above 1300 m, 40-60 km/h wind from the south, treeline temperatures around -3 C.

MONDAY: Unsettled weather with clouds and scattered flurries bringing another 5-15 cm of snow above 1000 m, 30-50 km/h wind from the southwest, treeline temperatures drop to -5 C.

TUESDAY: Mostly cloudy, isolated flurries with 5-10 cm of snow above 1000 m, 20 km/h wind from the southwest, treeline temperatures around -4 C.

WEDNESDAY: Mostly cloudy, isolated flurries with trace amounts of snow above 800 m, 20 km/h wind from the southwest, treeline temperatures around -5 C.

Avalanche Summary

Avalanche activity on Monday will be driven by the new snow.

A few slab avalanches were reported on Saturday including a small (size 1) human-triggered wind slab on a north aspect east of Whistler and a large (size 2.5) natural slab avalanche triggered by a cornice fall from the west side of Highway 99. There were also several small to large wet loose avalanches (size 1-2) on sun-exposed slopes. No reports from Sunday have been received at the time of publishing.

Snowpack Summary

By Monday afternoon there will be 15 to 30 cm of new snow above 1000 m, likely forming some reactive slabs in steep wind-affected terrain. As temperatures cool, this snow will sit above a crust layer in most areas except for north-facing slopes above 2000 m where dry snow was reported prior to the storm. The lower snowpack should be strong under the current cool weather, but large looming cornices remain a concern this time of year.

Terrain and Travel

  • Fresh wind slabs will likely form throughout the day, diligently watch for changing conditions.
  • Dial back your terrain choices if you are seeing more than 20 cm of new snow.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.

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.