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Avalanche Forecast

Archived

Mar 18th, 2024–Mar 19th, 2024

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

Regions

Yukon, Tutshi, Wheaton, White Pass East, White Pass West, Haines Pass.

Wind slabs remain reactive in cross-loaded and lee-facing terrain.

Confidence

Moderate

Avalanche Summary

A group of skiers remote-triggered a size 2 avalanche on a wind-loaded convex roll in the Wheaton area. Check out the associated MIN here.

Several small (size 1), loose wet avalanches were reported over the weekend at lower elevations and on south-facing terrain.

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

Snowpack Summary

Gradually dropping temperatures have likely created a surface crust up to roughly 1500 m.

At higher elevations recent snow has been redistributed by generally south winds. Deeper deposits of wind slabs can be found in leeward terrain.

In some areas, a weak layer of facets or surface hoar may persist, down approximately 50 to 80 cm from the surface.

Weather Summary

Monday Night

Mostly cloudy. 0 to 20 km/h west ridgetop wind. Treeline temperature -4 °C.

Tuesday

Mix of sun and cloud. 10 to 30 km/h northeast ridgetop wind. Treeline temperature -4 °C.

Wednesday

Mix of sun and cloud. 0 to 20 km/h northeast ridgetop wind. Treeline temperature -5 °C.

Thursday

Mix of sun and cloud. 0 to 20 northeast ridgetop wind. Treeline temperature -5 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Back off if you encounter whumpfing, hollow sounds, or shooting cracks.
  • If triggered, wind slabs avalanches may step down to deeper layers resulting in larger avalanches.

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.