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Avalanche Forecast

Archived

Apr 8th, 2024–Apr 9th, 2024

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 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

Coquihalla, Harrison-Fraser, Manning, Skagit.

Freshly formed storm slabs will be most reactive in wind affected terrain.

Use small low consequence slopes to test the bond of the new snow.

Confidence

Low

Avalanche Summary

Forecast snow and wind Monday night will likely form storm slabs reactive to human triggers on Tuesday.

If you go into the backcountry, please consider submitting your observations to the Mountain Information Network.

Snowpack Summary

15 to 25 cm forecast snow and wind will form storm slabs that will likely be reactive to human triggers on Tuesday.

Below the new snow is a crust everywhere except true north facing terrain at upper elevations.

Many areas below treeline are either snow free or have very thin snow coverage. Expect difficult travel at lower elevations.

Weather Summary

Monday Night

Snow, 15 to 25 cm (rain below 900 m). 50 to 60 km/h southwest ridgetop wind. Treeline temperature -4° C. Freezing level 1200 m.

Tuesday

Partly cloudy with isolated flurries, 0 to 3 cm snow. 30 to 40 km/h southwest ridgetop wind. Treeline temperature -3 °C. Freezing level 1500 m.

Wednesday

Mix of sun and cloud. 10 to 20 km/h southwest ridgetop wind. Treeline temperature 1 °C. Freezing level 1900 m.

Thursday

Mix of sun and cloud. 30 to 40 km/h south ridgetop wind. Treeline temperature 1 °C. Freezing level 2000 m.

Check out the Mountain Weather Forecast for additional weather information.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Choose conservative terrain and watch for clues of instability.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.
  • Be especially cautious as you transition into wind affected terrain.
  • Use small low consequence slopes to test the bond of the new snow.

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.