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Avalanche Forecast

Archived

Feb 2nd, 2021–Feb 3rd, 2021

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 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.

The winds finally arrived and have spiked the avalanche danger, reloading avalanche paths that released early in the storm.

I'd recommend the ski hill today. Limit your exposure to any overhead exposure.

Weather Forecast

Storm front will pass this morning, bringing cooler temps, gusty winds, and flurries.

Today: Cloudy/flurries, 5cm, FZL 1500m, mod gusting strong SW winds

Tonight: Cloudy/flurries, 10cm, FZL valley bottom, Alp low -11*C, light N winds

Wed: Isolated flurries, FZL 500m, Alp high -11*C, light/mod W winds

Thurs: Flurries, 10cm, FZL 800m, mod W winds

Snowpack Summary

A heavy, 40-50cm storm slab sits atop the previous drought layer (surface facets, surface hoar, wind affect, and sun crust). Overnight winds are rapidly building these into touchy slabs at all elevations. Previously dormant layers deeper in the snowpack (surface hoar/crust) may be waking up with the sudden heavy burden.

Avalanche Summary

Artillery control overnight produced numerous avalanches to sz 4. A natural avalanche cycle is currently flushing numerous avalanches up to sz 4 in the highway corridor, some within the same paths that were controlled 6hrs ago.

Confidence

Forecast snowfall amounts are uncertain

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.