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Avalanche Forecast

Archived

Nov 25th, 2021–Nov 26th, 2021

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

Regions

Lizard-Flathead.

Keep your head up as you gain elevation and exposure to the wind. As new snow stacks up, more reactive slabs will be in areas influenced by wind.

Confidence

Low - Uncertainty is due to the limited number of field observations. Forecast snowfall amounts are uncertain.

Weather Forecast

Thursday night: Snow, 15-20 cm. Southwest winds, 30-50 km/hr. Alpine temperature low -7 C. Freezing level 1500 m.

Friday: Flurries and snow, 5-10 cm through the day. Southwest winds, 30-50 km/hr. Alpine temperature high -1 C. Freezing level 1500 m.

Saturday: Mostly cloudy with isolated flurries, 5-10 cm. Southwest winds 20-50 km/hr. Alpine temperature high 1 C. Freezing level 1500 m and rising.

Sunday: Wet snow and rain, 30-50 mm. Southwest winds 35-45 gusting to 70 km/hr. Alpine temperature high 2 C. Freezing level 2300 m. 

Avalanche Summary

On Wednesday, Novermber 24, several small (size 1) wind slabs failed in steep alpine features. Note that we have limited field observations this early in the season.

Snowpack Summary

Wind has modified 10-20 cm of recent snow into a variety of pressed surfaces. This covers a supportive mid-November rain crust. The snowpack is drying out from the mid-November rain event, but moist snow is still found below the crust and to the ground.

Snowpack depths range from 40-70 cm at treeline elevations. Expect to find a deeper snowpack at higher elevations and in wind-loaded areas. Snowpack depths decrease rapidly below 1600 m.

Early season hazards are very real right now, be wary of thin/shallow snowpacks, rocks, stumps, creeks, and other sharks hidden under fresh snow.

Terrain and Travel

  • Be alert to conditions that change with elevation and wind exposure.
  • Watch for changing conditions today, storm slabs may become increasingly reactive.
  • Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
  • Make observations and assess conditions continually as you travel.

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.