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Avalanche Forecast

Archived

Apr 1st, 2023–Apr 2nd, 2023

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

Regions

.

Recent new snow and wind have likely created fresh wind slabs in the lee of terrain features.

Confidence

Moderate

Avalanche Summary

There are no recent observations from the Haines Pass area.

If you head out in the backcountry, let us know what you are seeing by submitting a report to the Mountain Information Network.

Snowpack Summary

20-25cm of new snow has likely accumulated Friday through Saturday. This snow will most likely be soft and low density in sheltered areas, but stiffer wind slabs could form in open terrain. This snow is falling on wind-pressed layers in the alpine and on a rain crust below 1300 m.

Weaknesses in the mid and lower snowpack are unlikely to produce avalanches under the current conditions. A weak layer of surface hoar/crust/facets buried in early January is now over 1 m deep in most areas, and has not produced avalanche activity for several weeks. The lower snowpack consists of basal facets, particularly in thin snowpack areas.

Weather Summary

Saturday Night

Cloudy with clear breaks, isolated flurries accumulation 1-4cm, light northwest wind, alpine temperature around -10 °C.

Sunday

Cloudy with sunny breaks, chance of flurries in the afternoon, light to moderate southwest wind, alpine temperature around -7 °C.

Monday

Mix of sun and cloud, no precipitation, moderate northwest wind, alpine temperature around -8°C.

Tuesday

Cloudy with scattered flurries, moderate southwest wind, alpine temperature around -7 °C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Dial back your terrain choices if you are seeing more than 20 cm of new snow.
  • Use ridges or ribs to avoid areas of wind loaded snow.
  • Use small low consequence slopes to test the bond of the new 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.