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Avalanche Forecast

Archived

Jan 8th, 2021–Jan 9th, 2021

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

Regions

Glacier.

Conservative decision making should still be applied today. Don't let the sunny skies and deep powder lure you into bigger, or steeper terrain features.

Weather Forecast

Expect mostly sunny skies today as the ridge of high pressure blocks a cold front attempting to infiltrate Rogers Pass; this front may produce some high cloud later this afternoon.

Today: Mainly sunny, no precipitation, Fl rising to 1300m and light wind.

Saturday: Mainly cloudy, light SW winds and a FL of 1200m

Snowpack Summary

We have received approx 90cm of new snow at TL before the sunny skies took over. Expect wind affected snow on the surface in the alpine, and exposed areas of TL. This storm buries a SH layer (Dec 26), which is preserved in sheltered areas at and below treeline. The Dec 7/13th surface hoar/crust/facet sandwich is now 1.5m below the surface.

Avalanche Summary

A small solar avalanche cycle was observed yesterday in the HWY corridor, with the average size of 1.5, max 2.5, mainly in extreme terrain and on solar asp. MIN reports from the Hermit and Asulkan areas reported comparable activity to size 1.5. Our neighbors at RMR reported several skier accidentals yesterday to size 1.5, and one partial burial!

Confidence

Problems

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.

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.

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.