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Avalanche Forecast

Archived

Feb 22nd, 2025–Feb 23rd, 2025

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

Regions

Coquihalla, Harrison-Fraser, Manning, Skagit.

Your travel Sunday likely comes in the wake of a natural avalanche cycle. Bring a conservative, 'assessment' mindset to investigate the aftermath. Human triggering is a serious concern.

Confidence

Low

Avalanche Summary

Some loose wet natural activity has been reported at lower elevations. A natural avalanche cycle is expected Saturday night and human triggering will be a serious concern for Sunday.

Snowpack Summary

An uncertain 20 - 40 cm of wet, heavy new snow may accumulate by end of day Sunday, adding to 20 cm of similarly upside-down storm snow that has fallen with variable wind. In sheltered terrain this new snow may overlie a problematic layer of faceted snow or surface hoar. In exposed terrain it may have been blown away to expose the underlying crust.

In the Manning Park area there has been less new snow and significantly less wind.

A crust from December is buried 80 to 140 cm deep, with facets around it in shallow snowpack areas. Otherwise, the lower snowpack is strong and bonded.

Weather Summary

Saturday night

Cloudy with 20 - 50 mm of mixed precipitation producing a possible 10 - 30 cm of alpine snow. 40 to 60 km/h southwest ridgetop wind. Freezing level 1700 m - 1900 m.

Sunday

Cloudy with 5 - 15 mm of mixed precipitation bringing up to 10 cm of alpine snow. 20 to 30 km/h southwest ridgetop wind. Freezing level 1700 m.

Monday

A mix of sun and cloud after 15 to 25 mm of mixed precipitation overnight produces 5 - 15 cm of alpine snow. 20 to 40 km/h southwest ridgetop wind. Freezing level rising to 1800 m in the afternoon.

Tuesday

Cloudy with scattered wet flurries bringing 5 - 10 cm of new snow, including overnight, greatest in the alpine. 40 - 50 km/h southwest ridgetop wind. Freezing level 1700 m.

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.
  • Closely monitor how the new snow is bonding to the old surface.
  • Be careful as you transition into wind-affected terrain.

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.

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.