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Avalanche Forecast

Archived

Mar 29th, 2021–Mar 30th, 2021

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 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.

Regions

Glacier.

While natural avalanche activity has tapered off, they still remain possible. Human triggered avalanches are likely today!

Weather Forecast

Cooler and drier conditions will prevail today and tomorrow, as the jet stream shifts to the North-West. Expect all types of weather today (sun, cloud, snow, and wind), as Spring convective conditions persist. Clouds are forecast to clear this evening, and temperatures continue to stay cool. Similar conditions can be expected tomorrow.

Snowpack Summary

Another 30cm at Treeline brings our storm totals to ~50cm <48 hours, and ~75cm in the last 72 hours! Strong Southerly winds and warm temperatures accompanying the new snow has formed storm reactive storm slabs. The March 18th layer is now buried 40-100cm depending on aspect and elevation.

Avalanche Summary

Numerous natural and artificially triggered avalanches occurred in the last 24 hours in the Highway Corridor. The average size was 2 to 3, with several size 3.5s, and a few size 4s. There was one skier accidental Min report from Hospital Gullies yesterday. Report from Connaught Creek this am mentioned Grizzly slide Path buried the skin track.

Confidence

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.