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Avalanche Forecast

Archived

Feb 10th, 2020–Feb 11th, 2020

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 possible, human triggered probable.
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, human triggered possible.

Regions

Glacier.

Heads up if the sun comes out today!Group management is key with loose dry avalanches running far and fast.

Weather Forecast

A trailing cold front will reach southern BC tomorrow, giving light precipitation to Rogers Pass.

Today: a mix of sun and cloud with light W winds. Daytime high -10C at treeline.

Tonight: flurries, 8cm precip. Temps steady at -10C, winds SW 30-50km/h.

Tuesday: cloudy with flurries, 4cm precip. with gusty winds up to 65km/h. Treeline temps -8C.

Snowpack Summary

Moderate to strong variable winds across the park yesterday redistributed this week's low density 40cm. Possible thin sun crust on steep SW aspects is down ~20cm. Below 1800m, the Feb 1 Melt-freeze crust is down 30cm and observed up to 10cm thick at 1300m. Expect rugged travel in treed areas below 1200m.

Avalanche Summary

Only one large (size 2.5) slab avalanche from Macdonald Gully 10 was observed yesterday, however poor visibility was obscuring observations above 1600m.

Saturday, numerous loose dry avalanches to size 1.5 were observed from steep features (>35 degrees) on all aspects and elevations.

Confidence

Intensity of incoming weather systems is uncertain

Problems

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.

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.