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Avalanche Forecast

Archived

Jan 14th, 2020–Jan 15th, 2020

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

Regions

Glacier.

Frostbite and Hypothermia are real concerns with these temperatures! 

Weather Forecast

Mainly sunny with with isolated flurries today. We may see an Alpine High of -23 thanks to a mild Inversion, and winds should stay light from the NE. Staying cold tonight, but we should start to see a change in the weather tomorrow, with 4 cm of new snow, and 15 cm on Thursday as a Low-Pressure system pushes through from the Pacific

Snowpack Summary

Light to strong winds have switched from S to NE, over the past 24hrs, and have likely built fresh wind slabs in immediate lees. Recent snowfall has settled to around 80cm over the Dec 27th surface hoar or crust depending on aspect and elevation. The mid and lower snowpack are generally well settled and strong.

Avalanche Summary

Mannix avalanche path in the Highway Corridor released naturally yesterday, size 3 terminating halfway down the fan, dusting the Highway. Explosive testing at Mt. Fidelity produced 4 small avalanches (size 1), soft slabs with limited propagation. A MIN reported of some shooting cracks on Little Sifton on cross loaded SW aspects

Confidence

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.