Dashboard Regions Weather Stations Radar Alerts Glossary
Contact About
Log In

Register for an account and never miss a forecast again!

Register

Avalanche Forecast

Archived

Nov 29th, 2022–Nov 30th, 2022

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

Be cautious as you transition into wind-affected terrain. Northerly outflow winds may form fresh wind slabs in atypical areas.

Cold temperatures, short days, and early season hazards should factor into your trip planning. Be prepared for an emergency and leave yourself plenty of daylight to get home safely.

Confidence

Low

Avalanche Summary

Over the weekend, recreationalists in White Pass observed reactive wind slabs on a variety of aspects as winds shifted from southwest through to north. Check out this MIN report for an example.

Looking forward to Wednesday, northerly winds may continue to form new, fresh wind slabs in lee areas. Watch for wind slabs on all aspects, but expect freshly formed slabs to be the most reactive.

Thank you for all the great Mountain Information Network reports over the weekend. They are beneficial to us in the early season when we have limited information and data sources. Please keep them coming!

Snowpack Summary

A thin, early season snowpack exists. An average of 65 to 85 cm can be found at treeline in White Pass. The upper snowpack has been heavily wind-effected, with hard wind slabs found on a variety of aspects. Upwards of 100 cm may exist in wind-loaded areas.

The lower snowpack consists of soft, sugary facets and a crust near ground level.

Weather Summary

Tuesday night

Clearing. Northeasterly winds 50-90km/h. Treeline temperature low of -28 C.

Wednesday

Increasing cloud cover. Northerly winds 30-60 km/h. Treeline temperature reaching a high of -20 C.

Thursday

Cloudy with snowfall, 5 cm accumulation. Northerly winds increasing in the afternoon to 40-60 km/h. Treeline temperature reaching a high of -18 C.

Friday

Partially cloudy, light snowfall. Northerly winds 30-50 km/h. Treeline temperature reaching a high of -20 C.

More details can be found in the Mountain Weather Forecast.

Terrain and Travel Advice

  • Recent wind has varied in direction so watch for wind slabs on all aspects.
  • Watch for signs of instability like whumpfing, hollow sounds, shooting cracks or recent avalanches.
  • Avoid steep, rocky, and wind effected areas where triggering slabs is more likely.

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.