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Avalanche Forecast

Archived

Apr 7th, 2021–Apr 8th, 2021

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

Regions

Glacier.

A poor refreeze overnight and incoming rain at lower elevations may trigger wet avalanches below treeline.

Cornices are popping, naturally and from people walking on them. Give them lots of room and respect.

Weather Forecast

Flurries and unsettled conditions for the next few days.

Today: Snow. 15-20cm, Alp high -4*C, FZL 1600m lowering to 900m tonight, ridge wind 25km/h gusting 65km/h

Thurs: Cloudy with sunny periods, trace precip, FZL 1300m, ridge winds 20km/h gusting 35km/h

Friday: Flurries, 10cm, FZL 1100m, ridge winds 20km/h gusting 60km/h

Snowpack Summary

Variable snow surfaces are present at the moment: 10-15cm settled powder on sheltered N aspects, thin wind-pressed surface skin below glacial toes, suncrust on solar aspects, and Spring melt/freeze crust below treeline. The March 18 suncrust/surface hoar is down ~80cm at treeline. Cornices, as always at this time of year, are large and fragile.

Avalanche Summary

Numerous cornice releases, triggering windslab below them, were reported yesterday up to size 2.5. This includes a close call from a skier remote triggering a cornice along the Jupiter Traverse.

Low elevation slopes became active in the afternoon yesterday with the sunshine, with loose wet avalanches to sz 2 observed.

Confidence

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.