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Avalanche Forecast

Archived

Apr 12th, 2021–Apr 13th, 2021

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

Regions

Glacier.

Don't forget it's still winter in the mountains. There is still almost 4m of snow at treeline!

Keep that mindset as you assess the recently formed wind slab in your travels today.

Weather Forecast

Hello high pressure! A Rex Block settles in that will result in sunny and dry conditions with elevated freezing levels into the foreseeable future.

Today: Sunny with cloudy periods. Freezing level 1600m. Wind E 15-30km/h

Tonight: Clear with cloudy periods. Fzl to valley bottom. Wind E-20km/h

Tuesday: Sunny! Fzl 1900m. Wind E 15-25km/h

Snowpack Summary

30cm of new snow on Friday/ Saturday with strong S winds fell on top of the April 7th sun crusts, wind pressed surfaces and melt freeze crusts at low elevations. The March 18 crust is down 90cm. A very strong and dense mid and lower pack sits on up to 50cm of decomposed crusts and large facetted crystals near the ground

Avalanche Summary

A new cornice release sz 2.0 was seen yesterday morning from Grizzly path. Several sz 1 ski cuts and natural avalanches have been reactive on small features on all aspects this week. A sz 2.5 natural was observed from MacDonald Gully 5 on Friday. Glide slabs are still releasing unpredictably, a sz 3 and a sz 4 last week on the S side of Mt Tupper.

Confidence

Due to the number of field observations

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.