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Avalanche Forecast

Archived

Jan 22nd, 2019–Jan 23rd, 2019

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

Regions

Glacier.

Thank you for all the MIN reports! Have a great day out there. Be mindful of isolated wind slabs, plus the regular hazards: Cornices, Crevasses, terrain traps etc..

Weather Forecast

The majority of this weak storm will miss us unfortunately. Snow today with only 5cm of accumulation, winds will moderate gusting to the low end of strong from the SW, and the Fl rising to 800m. Tonight we'll receive another 5cm, cooling temps and abating winds. Wednesday only flurries, before the next high-pressure engulfs us.

Snowpack Summary

The snowpack is settled and strong except for a few layers of note. First and foremost, the Jan17th SH layer buried 15-30cm. This layer is only problematic where the wind has created soft slabs above it. The buried PWLs (Nov 21st and Oct Crust) have been unreactive in stability tests, but may wake up later in the season, or in shallow areas.

Avalanche Summary

No new avalanches observed in the HWY corridor, or reported from the backcountry. There were 3 interesting avalanches over the weekend; one skier control size 2 in the Lookout Couloirs and 2 skier accidentals. One in Hospital Bowl and the other in the Ravens; both skier accidentals posted a MIN, or reported it to the Rogers Pass Discovery Center.

Confidence

Due to the number and quality of field observations

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.