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Avalanche Forecast

Archived

Mar 7th, 2025–Mar 8th, 2025

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

Regions

Coquihalla, Manning, Skagit.

New snow and moderate winds are expected to build fresh storm slabs throughout the day on Saturday.

Be alert to changing conditions throughout the day.

Confidence

Low

Avalanche Summary

No new avalanches were reported on Friday by 4 pm.

On Thursday, a rider triggered a size 2 slab avalanche on an open treeline feature in the Honeymoon area. The avalanche is believed to have released on a buried crust.

If you are headed to the backcountry, please consider sharing your photos and observations from your day on the Mountain Information Network.

Snowpack Summary

By Saturday morning, up to 5 cm of storm snow has accumulated, and an additional 10 to 15 cm of snow is expected through the day. Storm snow covers a crust on all aspects except on high north-facing terrain, where new snow buries up to 20 cm of snow overlying a crust from earlier in March.

A layer of facets and surface hoar from late January can be found down 50 to 120 cm.

The lower snowpack contains several crusts that are not concerning.

Weather Summary

Friday Night

Mainly cloudy with light furries starting early morning, 1 to 5 mm of mixed precipitation. 40 to 50 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1200 m.

Saturday

Cloudy with flurries, 10 to 15 mm of mixed precipitation. 40 to 50 km/h southwest ridgetop wind. Treeline temperature -2 °C. Freezing level rising to 1500 m.

Precipitation continues overnight, 5 to 10 mm of mixed precipitation.

Sunday

Cloudy with flurries, 10 to 20 mm of mixed precipitation. 30 to 50 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level rising to 1800 m.

Precipitation continues overnight, 10 to 20 mm of mixed precipitation.

Monday

Partly cloudy with light flurries, 2 mm of precipitation. 20 to 25 km/h southwest ridgetop wind. Treeline temperature -5 °C. Freezing level around 1000 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for fresh storm slabs building throughout the day.
  • Dial back your terrain choices if you are seeing more than 20 cm of new snow.
  • 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.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.