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Avalanche Forecast

Archived

Dec 17th, 2019–Dec 18th, 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 avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.

Regions

Glacier.

Keep your head up today!

Limit your exposure to overhead avalanche paths. The light, dry powder is creating fast, far-reaching avalanches that are quietly zipping into valley bottoms with little sound.

Weather Forecast

Continued snowfall adding up to another 10-15cm in the next 24hrs. Winds should increase to mod/strong from the SW with alpine temps reaching -7*C. Flurries for Wed, bringing another 8cm with mod/strong gusty SW winds and alpine temp of -6*C. Thursday shows a slackening in snow, but Fri/Sat could deliver another 25-30cm with winds and warmth.

Snowpack Summary

40cm of new snow now buries the Dec 11 surface hoar layer. Moderate S'ly winds are building storm slabs in the Alpine. 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

Natural avalanche activity to sz 2.5 began overnight and continues this morning in many highway-facing start zones. The loose, dry avalanches are traveling far and fast, reaching valley bottom and dusting up-tracks and the road.

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.