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Avalanche Forecast

Archived

Mar 2nd, 2021–Mar 3rd, 2021

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

Regions

Glacier.

Extreme south winds overnight will have created a smorgasbord of surfaces in exposed areas.

Be sure to re-assess as you change aspect and elevation today.

Weather Forecast

A benign weather day ahead.

Today: Cloudy with sunny periods and isolated flurries. Wind SW 20-40 km/h. Freezing level 1200m.

Tonight: Cloudy with clear periods and isolated flurries. Wind SW 20-35 km/h. Freezing level: 600m.

Wednesday: A mix of sun and cloud. Wind South 20-35 km/h. Freezing level: 1500m.

Snowpack Summary

Extreme southerly winds overnight (up to 118km/h!) will have created a variety of new surface slabs in exposed areas. Below the fresh snow transport, the upper snowpack continues to settle and gain strength. The Feb 14 drought interface is down ~1m in sheltered areas; this interface exists as buried windslabs, facets, or a thin suncrust.

Avalanche Summary

The Infrasound Detection Network in Glacier indicated some natural avalanches occurred during the extreme wind spike overnight. Yesterday, field teams were able to ski cut small size 1 wind slabs in the Dome area above 2200m. Sunday, one notable size 2.5 avalanche was observed that occurred from a steep solar feature in the alpine.

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.