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Avalanche Forecast

Archived

Mar 7th, 2021–Mar 8th, 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 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.

Regions

Glacier.

Strong convective weather could make for an exciting weather day!

Be prepared for intense storm cells in localized areas and subsequent increases in storm slab reactivity.

Weather Forecast

An unstable air mass today paves the way for strong convective activity: cloudy with sunny periods, isolated flurries, even the risk of a thunderstorm! High pressure sets in Monday.

Today: 5-10cm snow. Freezing level 1300m. Wind SW 20-35km/h.

Tonight: Cloudy with a trace of snow. Freezing levels lower to valley bottom. Wind SW 15-35km/h.

Snowpack Summary

At treeline,15cm of new snow sits atop a breakable crust and 10cm of moist snow. Localized extreme winds associated with the passing of a cold front on Friday, increased snow loading near ridges. The February facet/ crust persistent weak layer is down 80-120cm.

Avalanche Summary

Warm temperatures with new snow overnight Friday created a moist avalanche cycle with several size 1.5-2.5 avalanches observed from steep north aspects in the alpine in the highway corridor. Friday, a loose wet avalanche cycle occurred from steep solar aspects at all elevations up to size 2.5, as well as two notable size 3.0 slab avalanches.

Confidence

Timing, track, or intensity of incoming weather system is uncertain

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.

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.