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Avalanche Forecast

Archived

Dec 18th, 2019–Dec 19th, 2019

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

Regions

Glacier.

Another good day for conservative terrain choices! We are in a extended period of elevated hazard, the snowpack will need more time to settle and stabilize.

Weather Forecast

Snow easing to flurries today, temperatures in the alpine should hover around -6, and winds are forecasted to stay light to moderate from the South. Flurries continue overnight into Thursday, with accumulations up to 7cm. The main weather story is Friday/Saturday, each day receiving a foot of snow, strong winds and rising temperatures!

Snowpack Summary

50-60cm of new snow now buries the Dec 11 surface hoar layer. New snow, Moderate winds built storm slabs at all elevations. The Nov 23rd surface hoar/crust/facet combo is down +/-100cm (SH is most prevalent in sheltered treeline locations) but has become increasingly stubborn in testing. The mid-lower snowpack is settled and strong.

Avalanche Summary

Yesterday's natural avalanche cycle tapered off slightly last evening. The cycle produced avalanches to size 3-3.5 traveling far and fast, reaching valley bottom and dusting up-tracks and the road. The number of natural avalanches will decrease compared to yesterday; however, the size and destructive potential has increased with the added load!

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.

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.