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Avalanche Forecast

Archived

Dec 14th, 2018–Dec 15th, 2018

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

Regions

Glacier.

New snow will take time to stabilize. Now is the time to avoid avalanche terrain.

Weather Forecast

A mix of sun and cloud with isolated flurries will bring trace amounts of precipitation today. Freezing levels rise to 1600m with an alpine temperature of -2.0. Watch for strong southerly winds near ridge top this afternoon. After a clearing trend this weekend, another series of pacific systems will bring fresh loads of snow for early next week.

Snowpack Summary

40cm of new snow fell last night and throughout yesterday, bringing the 5-day storm total to over 110cm. Several instabilities exists within the storm snow.  The December 10th surface hoar, crust and facet layer is down 100cm. The November 21st persistent weak layer is down 120-160cm. Height of snow at treeline is approx 2m, and 1m at Rogers Pass.

Avalanche Summary

Artillery avalanche control produced several large avalanches (size 3-3.5) that terminated near the bottom of their run-outs. We suspect that there was a widespread natural avalanche cycle in the backcountry as storm conditions peaked near noon yesterday.

Confidence

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.