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Avalanche Forecast

Archived

Apr 11th, 2021–Apr 12th, 2021

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

Regions

Glacier.

Its still winter in the mountains. Remember to keep that mindset when leaving town in flip flops with a bbq planned for the afternoon

Weather Forecast

A ridge of high pressure is on the way. Light flurries are still possible Sunday.

Sunday:  Sun + cloud, trace snow, high -7, wind light, freezing level 1400m

Monday: Sun + cloud, trace snow, high -5, wind light gusting to E 35, freezing level 1500m

Tuesday: Sunny, nil precipitation, high -3, wind light gusting to E 30, freezing level 1800m

Snowpack Summary

30cm of new snow in 48hrs 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 dense mid and lower pack sits on up to 50cm of decomposed crusts and large facetted crystals near the ground

Avalanche Summary

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 and a new cornice release sz 2.0 was seen this morning from Grizzly path. Glide slabs are still releasing unpredictably, a sz 3 and a sz 4 this week on the S side of Mt Tupper.

Confidence

on Sunday

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.