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Avalanche Forecast

Archived

Apr 29th, 2019–Apr 30th, 2019

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

Regions

Banff Yoho Kootenay.

Cooler temps and flurries for the next few days should keep the loose wet problem at bay, but pay attention if the sun does appear as it wouldn't take much to trigger loose wet avalanches involving the new snow.

Weather Forecast

Expect convective afternoon flurries for the next couple of days. Temperatures will stay cool with a northerly component to the wind. This kind of weather pattern can result in some locally deep accumulations, so pay close attention to where you travel.

Snowpack Summary

Up to 40cm of snow fell over the weekend at higher elevations. Strong winds during the storm did some loading, but the storm ended calm and cold. While the new snow should settle rapidly, be suspicious of its bond to the old snow and of the facets interfaces below. Supportive crusts exist below this new snow on solar aspects & at lower elevations.

Avalanche Summary

No new avalanche activity was observed or reported in the past 2 days.

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.