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Avalanche Forecast

Archived

Apr 1st, 2024–Apr 2nd, 2024

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

Regions

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

Assess steep slopes around ridgelines and lee features for reactive wind slabs.

Confidence

Moderate

Avalanche Summary

No new avalanches have been reported.

Snowpack Summary

Snow surfaces have been significantly affected by recent winds. Expect to find extensive wind scouring, wind-pressed surfaces, and deep deposits of wind slabs around ridgelines at all elevations.

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 be triggered by the weight of a rider, but concern exists with very large loads, such as cornice falls.

Weather Summary

Monday Night

Cloudy with 2 to 10 cm of snow. 20 to 40 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Tuesday

Cloudy with 0 to 4 cm of snow. 10 to 30 km/h southwest ridgetop wind. Treeline temperature -6 °C.

Wednesday

Mix of sun and cloud. 20 to 40 km/h north ridgetop wind. Treeline temperature -6 °C.

Thursday

Mix of sun and cloud. 10 to 30 km/h southwest ridgetop wind. Treeline temperature -6 °C.

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

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.