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Avalanche Forecast

Archived

Apr 25th, 2024–Apr 28th, 2024

Alpine
Natural avalanches unlikely.
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.

Assess for the development of warming-related problems as the day heats up.

Confidence

Moderate

Avalanche Summary

Several naturally triggered loose wet avalanches and cornices released in the past few days. The loose wet avalanches were mostly small and occurred on steep sun-exposed slopes. The cornices released on northerly aspects in the alpine.

Similar avalanches are possible on Friday and Saturday with daytime warming. A cooling trend for Sunday will mean avalanche activity is unlikely, unless sufficient snow accumulates to form new slabs.

Snowpack Summary

Surface hoar crystals grow on settled snow that overlies a hard melt-freeze crust above 1200 m on northerly aspects. The crust is on the surface on sun-exposed slopes and below 1200 m. The crust will transition to moist snow with daytime warming and freeze back into a crust overnight. Sunday's snow will accumulate on these surfaces.

Cornices are large and looming at this time of year.

Weather Summary

Thursday Night

Clear skies. 5 km/h west ridgetop wind. Treeline temperature 0 °C.

Friday

Sunny. 10 km/h southwest ridgetop wind. Treeline temperature 4 °C. Freezing level 1600 m.

Saturday

Sunny. 10 km/h southeast ridgetop wind. Treeline temperature 4 °C. Freezing level 1600 m.

Sunday

Cloudy with 5 to 10 cm of snow. 10 to 20 km/h southwest ridgetop wind. Treeline temperature 0 °C. Freezing level 1100 m.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Back off slopes as the surface becomes moist or wet with rising temperatures.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.
  • When a thick, melt-freeze surface crust is present, avalanche activity is unlikely.

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.