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Avalanche Forecast

Archived

Jan 7th, 2020–Jan 8th, 2020

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

Regions

Glacier.

Storm day!

Conservative terrain choices that avoid overhead hazard will be key for today.

Be vigilant in monitoring changing conditions!

Weather Forecast

A strong low pressure system will cross the interior today, bringing up to 40mm of precip to Rogers Pass by tomorrow.

Today: Snow, heavy at times, 16cm. Freezing levels rising to 1400m. Winds light from the south, gusting strong

Tonight: Periods of snow, 15cm. Freezing level 1000m. Winds light from the south, gusting strong

Tomorrow: Isolated flurries

Snowpack Summary

Rogers Pass has received 100mm of precip in the past week, accompanied by strong to extreme S winds. Several weaknesses can be found within the 65-90cm of snow that lays above the persistent Dec 27th layer. The mid and lower snowpack have been strengthening, but don't forget about early season weaknesses with the increased load today.

Avalanche Summary

Expect another natural avalanche cycle to begin today with increased loading from today's storm occurs. Numerous avalanches up to size 3.5 in the highway corridor were triggered both naturally and by artillery on Saturday.

Confidence

Intensity of incoming weather systems is uncertain

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.

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.