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Avalanche Forecast

Archived

Feb 18th, 2021–Feb 19th, 2021

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

Regions

Glacier.

Hard wind slabs overlying facets, are behaving more like persistent slabs, and becoming harder to trigger.

The best riding conditions exist in sheltered areas at and below tree line.

Weather Forecast

Today is starting off cold and clear. High cloud will start to push through this afternoon, as a storm system off the coast tries to move over Rogers Pass. Alpine temperatures will hover around -10, and  winds will be light from the SW. Flurries tonight, with increasing winds. 6cm of new snow on Friday, 7cm on Friday, and 33cm on Sunday.

Snowpack Summary

Approx 15cm of new snow covers a variety of old surfaces, from hard wind slabs in the alpine and exposed areas of TL, to low density facetted snow in sheltered areas at TL and below. Cold temps continue to facet the upper snowpack, and weaken cornices. The January 24th interface is down 70-100cm and predominantly unreactive in stability tests.

Avalanche Summary

No new avalanches were observed int he HWY corridor yesterday. A MIN report of a size 1 slab avalanche in Camp West Lite size 1-1.5. Another MIN report of sluffing to size 1 up the Asulkan drainage. Overall very minimal avalanche activity has been observed recently.

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.