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Avalanche Forecast

Archived

Apr 11th, 2013–Apr 12th, 2013

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

Regions

Kootenay Boundary.

Due to a lack of information sources at this time of year, this forecast is based primarily on weather data. If you have been traveling in the backcountry recently, send us your observations. Email us at [email protected]

Confidence

Fair - Due to limited field observations for the entire period

Weather Forecast

Friday: Mainly overcast with some sunny breaks early in the day. Clouds increasing in the afternoon with light precipitation possible. Freezing level 1000m and strong southwest winds.Saturday: Light to moderate precipitation possible with the passage of a cold front. Freezing level 1400m. Winds moderate from the west.Sunday: A cold and unstable airmass will bring a mixed bag of weather conditions. Cool temperatures, mainly overcast with some sunny breaks and possible snow showers.

Avalanche Summary

No new avalanches reported. Expect loose wet snow releases from steep terrain at treeline and below. Pockets of wind slab may be triggered by skiers or riders at higher elevations.

Snowpack Summary

40-60cm of new snow has fallen at 1800m elevation and above in last 4 days. This new snow sits on a crust at upper elevations. The snowpack continues to be moist or wet below this crust. Recent moderate to strong winds have created wind slabs in alpine leeward slopes. At lower elevations the snowpack is wet and isothermic.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.