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Avalanche Forecast

Archived

Apr 20th, 2024–Apr 21st, 2024

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.
Below Treeline
Natural avalanches unlikely.
Alpine
Natural avalanches unlikely.
Treeline
Natural avalanches unlikely.
Below Treeline
Natural avalanches unlikely.

Regions

Northwest Coastal, Boundary, Stewart.

Large persistent slab avalanches may remain possible to human trigger at treeline and above.

Avoid steep or convex slopes where triggering slabs is more likely.

Confidence

Moderate

Avalanche Summary

A few naturally triggered wind slab avalanches up to size 2 were reported on a variety of aspects in the alpine on Friday.

Field observations are currently very limited in this region. Please consider sharing your observations to the Mountain Information Network.

Snowpack Summary

A hard melt-freeze crust exists on the snow surface on sun-exposed slopes to the mountain tops. The crust will transition to wet snow with daytime warming and generally re-freeze at night.

Dry snow may still be found on true north aspects at upper elevations.

In isolated locations, a weak layer of facets and/or surface hoar is down 50 to 100 cm. It is most likely to be in terrain sheltered from the wind at treeline and above.

Weather Summary

Saturday night

Increasing cloudiness. 10 to 20 km/h west ridgetop wind. Treeline temperature -1 °C. Freezing level 1300 m.

Sunday

Mostly cloudy. 20 to 30 km/h west ridgetop wind. Treeline temperature 0 °C. Freezing level 1400 m.

Monday

Mix of sun and cloud. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -1 °C. Freezing level 1300 m.

Tuesday

Cloudy with flurries, 5 to 10 cm snow. 20 to 30 km/h southeast ridgetop wind. Treeline temperature -1 °C. Freezing level 1300 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be aware of the potential for surprisingly large avalanches due to deeply buried weak layers.
  • Avoid steep convex slopes.
  • Look for signs of instability: whumphing, hollow sounds, shooting cracks, and recent avalanches.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

Problems

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.