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Avalanche Forecast

Archived

Mar 5th, 2017–Mar 6th, 2017

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 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, human triggered possible.

Regions

Glacier.

Human triggered avalanches are likely today. The storm slab will require a couple of days to bond to underlying surfaces. Remote triggering of avalanches is a very real possibility.

Weather Forecast

Cloudy with sunny periods today. Light winds from the NE. Freezing levels should remain below 800m. Isolated flurries with sunny breaks and cooler temperatures are forecasted for Monday/Tuesday, with winds becoming moderate from the SW.

Snowpack Summary

The storm snow totals 65-70cm from the last few days. Strong/extreme southerly winds built up touchy storm slabs at all elevations on all aspects. These widespread slabs have been failing within the storm layers, as well as digging down to fail on deeper persistent sliding layers (crusts or surface hoar).

Avalanche Summary

Widespread avalanche activity up to size 3.5 yesterday in the highway corridor as well as in the backcountry. Numerous crown-lines were observed from the valley-bottom that showed wide propagation around ridges and gullies. Skiers remote triggered from 200m away a size 2.5 slab avalanche on Teddy Bear Trees that partially buried several skiers.

Confidence

Due to the number of field observations

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.