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Avalanche Forecast

Archived

Dec 8th, 2024–Dec 9th, 2024

Alpine
Natural avalanches possible, human triggered probable.
Treeline
Natural avalanches unlikely, human triggered possible.
Below Treeline
Natural avalanches unlikely, human triggered possible.
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, St. Mary.

Storm snow likely remains rider triggerable. Watch for deeper and more reactive deposits in wind affected terrain and remember surface hoar may be present in sheltered terrain

Confidence

Moderate

Avalanche Summary

A mix of conditions produced a variety of avalanches on Saturday, with loose wet at low elevations, and loose dry or storm slab at higher elevations where snow remained mostly dry. With more snow received Saturday night, we expect avalanche activity to have increased.

Snowpack Summary

Around 30 cm of storm snow has fallen in the last 3 days. Low elevations received mostly rain with wet snow at higher elevations. This sits over a mix of sun crusts, surface hoar in wind-sheltered terrain, and wind-affected snow.

The middle of the snowpack is generally expected to be well-settled and stable. Total snow depths vary from 100 to 150 cm at treeline.

Weather Summary

Sunday Night

Partly cloudy. 10 to 20 km/h west ridgetop wind. Treeline temperature -10 °C.

Monday

A mix of sun and cloud. 20 to 30 km/h northwest ridgetop wind. Treeline temperature -6 °C.

Tuesday

A mix of sun and cloud. 30 to 40 km/h west ridgetop wind. Treeline temperature -6 °C.

Wednesday

A mix of sun and cloud. 30 to 40 km/h west ridgetop wind. Treeline temperature -4 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Continue to make conservative terrain choices while the storm snow settles and stabilizes.
  • Be careful with wind-loaded pockets, especially near ridge crests and rollovers.
  • Closely monitor how the new snow is bonding to the old surface.

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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.