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Avalanche Forecast

Archived

Apr 9th, 2022–Apr 10th, 2022

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

Lizard-Flathead.

Convective flurries are expected in localized areas. Expect to find touchy pockets below ridges and around steep terrain. 

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

Saturday night: Blustery with alpine flurries, up to 10 cm. Light southwest wind. Ridgetop low -10 C.

Sunday: Bands of convective moisture producing localized flurries 5-15 cm with higher amounts near the US border and Waterton. Light northwest-west wind. Ridgetop high -3 C.

Monday: Overnight flurries with up to 15 cm by morning. Gusty and increasing east-northeast wind. Ridgetop high -8 C.

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

Avalanche Summary

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

Snowpack Summary

5-15 cm fresh snow covers a crust on all aspects except high north terrain. Cold, dry snow will not bond well to the crust and wind may quickly redistribute snow to lee features.

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

Terrain and Travel

  • Wind slabs may be poorly bonded to the underlying crust.
  • 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.