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Avalanche Forecast

Archived

Jan 13th, 2023–Jan 14th, 2023

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

Lizard-Flathead, Flathead, Lizard, Moyie.

Continually assess the snowpack for signs of instability with dynamic weather conditions.

Confidence

Moderate

Avalanche Summary

No recent avalanche activity has been reported in the region.

Please continue to share any observations or photos on the Mountain Information Network.

Snowpack Summary

Wet flurries and high freezing levels produced moist surface snow up to 2000 m on Friday. Above 0 C temperatures were reported above 2100 m. As temperatures cool a crust will form. Isolated flurries through Saturday are not expected to accumulate beyond 5 cm.

A widespread melt-freeze crust is buried 50-90 cm. This crust ranges in thickness from 1 cm at higher elevations to 20 cm thick at lower elevations. Below the crust, the mid-snowpack is settled and consolidated.

A crust and facet layer is down 70-150 cm. Below the crust, the basal snowpack is weak and faceted. Treeline snow depths average 150-200 cm.

Weather Summary

Friday night

Isolated wet flurries, trace accumulation. Moderate southwest ridgetop winds. Treeline low temperatures -6 C. Freezing level falling to 1500 m.

Saturday

Cloudy with flurries, up to 5 cm. Light and gusty southwest ridgetop winds. Treeline temperatures around 0 C. Freezing level 1500 m.

Sunday

Cloudy with flurries, up to 5 cm. Light south ridgetop winds. Treeline high temperatures -1 C, freezing level 1500 m.

Monday

Cloudy with isolated flurries. Light southwest ridgetop winds. Treeline high temperatures -3 C, freezing level 1100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.
  • The more the snowpack warms-up and weakens, the more conservative you`ll want to be with your terrain selection.

Problems

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.