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Avalanche Forecast

Archived

Mar 20th, 2024–Mar 21st, 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.

Lingering wind slabs still exist in exposed, alpine terrain features.

Traveling may be challenging on hard snow surfaces at lower elevations.

Confidence

Moderate

Avalanche Summary

On Tuesday, several natural wind slab avalanches (up to size 2) were observed on steep rocky terrain or below cornices of north aspects. A group of skiers remote-triggered a size 2 avalanche on a wind-loaded convex roll in the Wheaton area on Sunday. Check out the associated MIN here.

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

Snowpack Summary

A widespread surface crust likely exists up to roughly 1500 m.

At higher elevations, recent snow has been redistributed by winds from various directions. Deeper deposits of wind slabs can be found in exposed 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

Wednesday Night

Partly clear with no precipitation. 10 to 30 km/h north ridgetop wind. Treeline temperature -9 °C.

Thursday

A mix of sun and cloud with no precipitation. 10 to 30 km/h north ridgetop wind. Treeline temperature rising to 0 °C.

Friday

Partly cloudy. 10 to 20 km/h southwest ridgetop wind. Treeline temperature -2 °C.

Saturday

Sunny with cloudy periods. 10 to 20 km/h northwest ridgetop wind. Treeline temperature -3 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Be especially cautious as you transition into wind affected terrain.
  • Carefully evaluate steep lines for wind slabs.
  • 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.