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Avalanche Forecast

Archived

Mar 30th, 2024–Mar 31st, 2024

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

Regions

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

Fresh snow! ...and wind. Expect to find more reactive deposits in wind-loaded areas and a more widespread problem as snowfall accumlates.

Confidence

Moderate

Avalanche Summary

No new avalanches have been reported.

Cornices are big, give them space both above and below, and expect large cornices to be fragile, especially with loading or daytime warming.

Snowpack Summary

Up to 20 cm fresh snow on Saturday alongside strong southwest wind.

Under this new snow, a widespread crust covers most surfaces at lower elevations and sunny aspects into the alpine. Cold, dry snow remained on shady aspects at upper elevations, and recent winds redistributed and pressed available snow into northerly aspects.

Large, fragile cornices can be found on exposed ridgelines and should be given a wide berth.

In some areas, particularly in the Haines Summit, a weak layer of facets or surface hoar is buried 50-80 cm. This layer is unlikely to trigger from the weight of a rider, but concern exists with very large loads like cornice falls.

Weather Summary

Saturday Night

Snow and flurries, up to 10 cm. Southwest ridgetop wind 40-80 km/h. Treeline temperature low of -6 °C. Freezing level valley bottom.

Sunday

Flurries, another 5-10 cm snow. Strong southwest ridgetop wind 40-70 km/h. Treeline temperature -6 °C. Freezing level valley bottom.

Monday

Flurries, up to 5 cm. Southwest ridgetop wind decreasing to 30-50 km/h. Treeline temperature -8 °C. Freezing level valley bottom.

Tuesday

Snow, 5-10 cm. Southwest ridgetop wind 20-40 km/h. Treeline temperature -6 °C. Freezing level valley bottom.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Closely monitor how the new snow is bonding to the crust.
  • Watch for newly formed and reactive wind slabs as you transition into wind affected terrain.
  • Use extra caution around cornices: they are large, fragile, and can trigger slabs on slopes below.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

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.