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Avalanche Forecast

Archived

Nov 26th, 2019–Nov 27th, 2019

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

Regions

Glacier.

Early season conditions are still in effect. Buried rocks, alder and stumps could ruin your season. Days are short, give yourself plenty of time to get back to the parking lot.

Weather Forecast

An Arctic high pressure moves over Rogers Pass, bringing with it cold and clear air. There is a chance of convective flurries and moderate winds from the NE though today. No significant accumulated precipitation is in the long term forecast. The only notable weather event that is forecasted, will be cold Northerly winds this week.

Snowpack Summary

The weekend's 40cm of storm snow was accompanied by mod-strong S'ly winds, which have built fresh storm slabs. These slabs overlay either 5-10mm surface hoar at treeline and below, or a crust, which is widespread below 1600m and on steep solar aspects. Persistent slabs exist down 60-90 cm and may be triggered by larger loads.

Avalanche Summary

Sunday's storm produced a decent natural avalanche cycle to size 3 in Rogers Pass over the weekend. These avalanches traveled through brush-filled terrain below treeline, into valley bottoms. Avalanche activity has tapered off since the storm; with only one report of a skier triggered avalanche yesterday on Glacier Crest.

Confidence

Due to the number of field observations

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.