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Avalanche Forecast

Archived

Apr 24th, 2019–Apr 25th, 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

Northwest Coastal.

Limited recent field observations mean that this forecast should be used to guide your initial assessment of conditions. See our 'Cold & Snowy' spring scenario for more on managing current conditions.

Confidence

Low - Due to the number of field observations

Weather Forecast

Wednesday night: Cloudy with scattered flurries bringing a trace to 5 cm of new snow. Light southwest winds.

Thursday: Cloudy with sunny periods. Light variable winds. Alpine high temperatures around -5 with freezing levels to 1200 metres.

Friday: Cloudy with flurries bringing approximately 10 cm of new snow. Light to moderate south winds shifting southwest. Alpine high temperatures around -6 with freezing levels to 1000 metres.

Saturday: Sunny with cloudy periods. Light northeast or northwest winds. Alpine high temperatures around -3 with freezing levels to 1300 metres.

Avalanche Summary

Reports from the Bear Pass area on Wednesday showed diminishing natural avalanche activity with a few new size 2 (large) wind slab releases observed in steep leeward features in the alpine.

Reports from the same area on Monday described a natural avalanche cycle driven by new snow and strong winds. The cycle led with natural wind slab releases reaching size 3 (very large) in the morning and followed with wind slab releases decreasing in size and shifting to east aspects as winds became extreme and shifted west in the afternoon.

No new avalanches have been reported in the south of the region.

Please submit your observations to the Mountain Information Network.

Snowpack Summary

Another variable trace to 10 cm of new snow fell over Tuesday night, adding to 10-30 cm of new snow that fell Sunday night and Monday. Moderate to strong southwest winds are expected to have formed reactive wind slabs with much of this recent snow. The new snow sits on an older layer of settled storm snow from last week, which itself overlies a now 40-60 cm-deep melt freeze crust. This crust is widespread with the possible exception of high elevation north aspects. Most of our recent precipitation has fallen as rain at 1000 m and below.

Another widespread crust that formed in early April is down 50 to 100 cm. Weak layers of surface hoar and facets were previously observed on this crust on high elevation north facing slopes. At lower elevations, ongoing warm weather has been promoting isothermal snowpack conditions and melting the snowpack away.

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.