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Avalanche Forecast

Archived

Feb 3rd, 2019–Feb 4th, 2019

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

Regions

Glacier.

The natural avalanche cycle is abating. Human triggering of avalanches is likely.

Weather Forecast

Cold air has invaded overnight bringing moderate Easterly winds light precipitation and temperatures in the -19C range. The cold air and Easterly flow are forecast to be here at least until mid week.

Snowpack Summary

At 1900m upwards of 70cm of storm snow in the past 72hrs with mod to strong S'ly wind. Wind is now shifted to NE mod. New snow sits atop hard wind slabs in the alpine and Jan 31 surface hoar at and below treeline. January 17 surface hoar is buried 90cm+ and is most reactive between 1400-1900m, and where it overlies a crust on steep solar aspects.

Avalanche Summary

Yesterday Grizzly Gulley ran across the normal skin track just prior to a group of skiers arriving. Avalanche covered approximately 150m of skin track 1m deep. Several new natural avalanches recorded in the highway corridor yesterday. Some of these slides were new on Feb 2nd while others likely ran on Feb 1st at the height of the storm.

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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.