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Avalanche Forecast

Archived

Feb 3rd, 2017–Feb 4th, 2017

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural avalanches possible, human triggered probable.
Alpine
Natural and human triggered avalanches likely.
Treeline
Natural avalanches possible, human triggered probable.
Below Treeline
Natural avalanches possible, human triggered probable.

Regions

Lizard-Flathead.

There is a lot of uncertainty with snowfall amounts through the period. There is good potential for amounts to exceed what is forecast. If that is the case, expect danger ratings to be higher than indicated.

Confidence

Moderate - Intensity of incoming weather systems is uncertain on Saturday

Weather Forecast

Saturday: Flurries, accumulation 5-10cm overnight Friday into Saturday morning and an additional 10-15cm through the day / Light east wind / Alpine temperature -10Sunday: Periods of snow, accumulation 15-25cm / Light to moderate east wind / Alpine temperature -3Monday: Flurries, accumulation 10-15cm / Light to moderate east wind / Alpine temperature -15More details can be found on the Mountain Weather Forecast.

Avalanche Summary

There is no recent avalanche activity to report from the last few days, although I would expect avalanche activity to start to increase as new snow amounts start to accumulate over the coming days.

Snowpack Summary

Anywhere from 10-20cm of new snow is laying on previous surfaces that may include heavily wind affected snow, surface hoar in sheltered areas and/or facets. Crusts can be found near the previous surface on solar aspects at high elevations and on all aspects below 1600m. There have been isolated reports of a surface hoar layer from early January buried about 40-50cm deep in sheltered areas, although not much is known about its current reactivity. About 70cm below the surface, you'll find sugary facet crystals which formed during December's cold snap. Although avalanches are currently unexpected at this interface, this layer could come back to life with with warming, significant loading or a large trigger at a thin spot.

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.