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Avalanche Forecast

Archived

Dec 23rd, 2020–Dec 24th, 2020

Alpine
Natural avalanches possible, human triggered probable.
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.

Considerable avalanche hazard and sunny days after a big storm is traditionally the most common conditions for avalanche incidents!

Weather Forecast

Today: Sunny with cloudy periods as Rogers Pass is under a ridge of high-pressure. No precipitation, light SW winds, a inversions of temperatures is forecasted to start today.

Tonight: Clear with valley fog, inverted temperatures, light winds, and no precipitation.

Thursday: Sunny/high-pressure, light winds, and no precipitation.

Snowpack Summary

140cm of snow over the last 6 days, along with strong S-SW winds and warm temps, has created a sensitive slab at all elevations. The Dec 13 surface hoar/facets are down 140cm+ and the Dec 7 crust/surface hoar layer is down 150cm+. The Nov 5 crust lingers near the base of the snowpack and several avalanches over the storm period stepped down to it.

Avalanche Summary

On Monday evening artillery and RACS controlled avalanche to size 4, averaging size 3. Naturals observations yesterday, from Monday night's avalanche cycle up Connaught creek to size 3.5 in a MIN report. Natural activity has decreased with the passage of the storm, as we are now into a more benign weather pattern. Human triggering remains likely.

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.