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Avalanche Forecast

Archived

Mar 18th, 2026–Mar 19th, 2026

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

Regions

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

Forecast strong south winds on Thursday may form reactive wind slabs on lee features.

Watch for newly formed and reactive wind slabs as you transition into wind-affected terrain.

Confidence

Moderate

  • We are uncertain due to a limited number of field observations.

Avalanche Summary

No new avalanches were reported on Tuesday. However, observations in this region are very limited.

If you head out into the backcountry, let us know what you're seeing by submitting a MIN report.

Snowpack Summary

Cornices are large and looming. Avoid traveling underneath them.

Forecast strong south winds on Thursday may form reactive wind slabs on lee features. 15 to 20 cm of recent snow overlies heavily wind-affected surfaces in open areas at all elevations. Up to 60 cm of snow can be found in sheltered areas.

Two persistent weak layers of either crust/facets or surface hoar may be found in the top 100 cm of the snowpack. No recent avalanches have been reported on these layers.

Facets or depth hoar exist at the base of the snowpack, especially in the inland areas that have a shallower snowpack.

Weather Summary

Wednesday Night
Partly cloudy. 3 to 5 cm of snow. 30 km/h south ridgetop wind. Treeline temperature -12 °C.

Thursday
Mix of sun and clouds. 0 to 5 cm of snow. 50 km/h south ridgetop wind. Treeline temperature -10 °C.

Friday
Mix of sun and clouds. 40 km/h south ridgetop wind. Treeline temperature -11 °C.

Saturday
Mix of sun and clouds. 30 km/h southeast ridgetop wind. Treeline temperature -10 °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.
  • Avoid steep, rocky, and wind-affected areas where triggering slabs is more likely.
  • Use ridges or ribs to avoid areas of wind-loaded snow.

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.