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Avalanche Forecast

Archived

Apr 10th, 2022–Apr 11th, 2022

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.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Lizard-Flathead.

Check for pockets of wind slab around steep and high-consequence features.

Confidence

Moderate - Uncertainty is due to the speed, direction, or duration of the wind and its effect on the snowpack.

Weather Forecast

Sunday night: Blustery with alpine flurries, up to 10 cm with higher amounts near Waterton NP and the US border. Increasing east wind. Ridgetop low -14 C.

Monday: Unsettled and convective. Gusty and increasing east-northeast wind. Ridgetop high -8 C.

Tuesday: Cloudy with isolated flurries. Moderate to strong east wind. Ridgetop high -10 C.

Wednesday: Mostly cloudy with sunny breaks. Light east wind. Ridgetop high -8 C.

Avalanche Summary

On Saturday, small slab avalanches to size 1.5 were reactive to skiers and explosives, especially near ridgetop lee features.

A few wet loose avalanches were reported on Thursday and Friday, several from steep, rocky, solar terrain.

Snowpack Summary

Spring conditions have left a crust covered and deteriorating snowpack below 1600 m. At upper elevations, 5-20 cm recent and settling snow covers a crust on all aspects except high north terrain.

Multiple crusts exist in the upper snowpack. The mid and lower snowpack are generally strong and well bonded.

Terrain and Travel

  • Carefully evaluate steep lines for wind slabs.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.