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Avalanche Forecast

Archived

Jan 8th, 2020–Jan 9th, 2020

Alpine
Natural and human triggered avalanches likely.
Treeline
Natural and human triggered avalanches likely.
Below Treeline
Natural and human triggered avalanches likely.
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.

Go to the ski hill today! 70cm overnight has caused a natural avalanche cycle that is continuing with strong S'ly winds.

Weather Forecast

Unsettled air will persist as the low pressure trough moves out of the region.

Today: Flurries, 5cm. Freezing levels dropping to the valley floor. Mod/strong S'ly winds.

Tonight: Flurries, trace to 5cm. Freezing level valley floor. Light W'ly winds.

Tomorrow: Isolated flurries, alpine temps -17*C, light W'ly winds

Snowpack Summary

Whoa! The snowpack just got stressed overnight! Over 70cm fell last night at tree-line, bringing the weekly total to over 1.5m. Several weaknesses in the new snow can be found in the metre+ that lays above the persistent Dec 27th layer. The November and early Dec crusts and surface hoar layers may awaken with the rapid increase in load.

Avalanche Summary

The natural avalanche cycle roared all night and continues today. Avalanches from artillery overnight ranged from sz 2.5 to 3.5 from most targets. Expect the natural avalanche cycle to continue with strong S'ly winds reloading the start zones all day.

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.

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.

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.