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Avalanche Forecast

Archived

Apr 17th, 2018–Apr 18th, 2018

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, human triggered possible.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Inland.

There is a lack of information to base our avalanche forecasts on this time of year. As a result, this forecast is based solely on weather information. If you have been out recently, post your observations to the Mountain Information Network (MIN).

Confidence

Low - Due to the number of field observations

Weather Forecast

WEDNESDAY: Cloudy with sunny periods. Light to moderate southwest wind. Alpine temperature -3. Freezing level 1300 m. THURSDAY:  Cloudy with isolated flurries. Moderate to strong southwest wind. Alpine temperature -4. Freezing level 1200 m. FRIDAY: Cloudy with sunny breaks and isolated flurries. Moderate south wind. Alpine temperature -2. Freezing level 1400 m.

Avalanche Summary

No recent new avalanches have been reported.

Snowpack Summary

Lingering wind slabs on convex features below ridgetops may still be reactive to human triggers. Weak layers buried around March 19th are roughly 40 cm below the surface (up to 100 cm in deeper snowpack areas). These weak layers include surface hoar on shaded aspects at high elevations and hard crusts on solar aspects and below treeline.Sugary facets may be found near the base of the snowpack in shallow, rocky snowpack areas on shady aspects.

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.