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Avalanche Forecast

Archived

Apr 3rd, 2015–Apr 4th, 2015

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

Regions

Northwest Inland.

Exercise caution on slopes with potential wind loading from recent storms. If you have any observations you'd like to share, please consider submitting to the Mountain Information Network. Click here for more information on how to share.

Confidence

Fair - Due to the number and quality of field observations

Weather Forecast

15 to 20cm of precipitation on Friday afternoon into Saturday, before generally dry conditions prevail for Sunday. Mostly light and gusty south easterly alpine winds are expected throughout the forecast period. Daytime high freezing levels should hover around 1400 m each day.

Avalanche Summary

Reports from Wednesday are limited to just one new Size 2 natural wind slab avalanche on a northeast facing alpine slope below a ridge crest. However, reports from Tuesday include several small natural and skier triggered wind slab avalanches in lee and cross-loaded treeline and alpine terrain. The reports mentioned surprisingly little large avalanche activity given the strong winds and amount of fresh snow available for wind-transport.

Snowpack Summary

Approximately 15-30 cm of dense storm snow overlies a variety of crusty old surfaces. Recent strong winds have scoured windward slopes and loaded leeward slopes below ridge crests and behind terrain features. Persistent weaknesses buried in the upper snowpack may include hard crusts and/or facet crystals, although not much is known about the reactivity or spatial distribution of these layers. At the base of the snowpack, weak facets may be found. Cornices are large and potentially fragile. Unpredictable, full-depth glide avalanches are also a concern on low elevation slopes with smooth ground cover (grassy slopes, rock slabs, etc.) where large cracks have formed from the snowpack slipping on the ground.

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.