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

Apr 8th, 2021–Apr 9th, 2021

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

Regions

Cariboos.

New snow and strong wind are driving the avalanche hazard. Reactive wind slabs will likely be found at treeline and in the alpine. 

Loose snow avalanches can be expected in the new snow on steep terrain features. They can run far and fast, especially where they sit on a crust. 

Confidence

Moderate - Forecast snowfall amounts are uncertain.

Weather Forecast

Unsettled weather continues with more snow, strong winds, and seasonally cool temperatures.

Friday: Cloudy with light snow 5-10 cm. Ridgetop wind moderate to strong from the southwest. Alpine temperatures near -12 and freezing levels 1100 m.

Friday Night: Snow amounts 5-10 cm with strong southwest winds at ridgetop.

Saturday: A mix of sun and cloud with convective flurries. Ridgetop wind light from the northwest. Alpine temperatures near -13 and freezing levels 800 m. 

Sunday: A mix of sun and cloud with light ridgetop wind from the northwest. Alpine temperatures -10 and freezing levels 1300 m. 

Avalanche Summary

On Wednesday, the North Rockies Feild team reported and wind slab size 1 from an East aspect at treeline. Observations were limited due to poor visibility.

New snow and strong winds shifting from the southwest to northwest have likely formed fresh and reactive wind slabs on leeward slopes at treeline and in the alpine. 

Loose snow avalanches within the new snow can be expected from steeper slopes and terrain features, especially if the sun comes out.

Give cornices a wide berth from above and below. Strong wind and solar radiation may increase the chance of cornice failures. 

Snowpack Summary

Winter weather returns with new snow 10-20 cm across the region. Strong wind from the southwest to the northwest has likely formed fresh and reactive wind slabs on leeward slopes and behind terrain features. The new snow sits on a series of melt-freeze crusts on all aspects below 1900 m and southerly aspects to mountain top. On North aspects in the alpine, the new snow will sit on dry wintery and wind-affected snow surfaces. 

The recent warm weather is expected to have helped old persistent weak layers heal, including a few crusts buried over the last month as well as a facet layer 150 cm deep from the mid-February cold snap.

Terrain and Travel

  • Be careful with wind slabs, especially in steep, unsupported and/or convex terrain features.
  • Use ridges or ribs to avoid areas of wind loaded snow.
  • Be aware of the potential for loose avalanches in steep terrain where snow hasn't formed a slab.
  • Watch your sluff: it may run faster and further than you expect.
  • Pay attention to cornices and give them a wide berth when traveling on or below ridges.

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.

Cornices

Cornice Fall is the release of an overhanging mass of snow that forms as the wind moves snow over a sharp terrain feature, such as a ridge, and deposits snow on the downwind (leeward) side. Cornices range in size from small wind drifts of soft snow to large overhangs of hard snow that are 30 feet (10 meters) or taller. They can break off the terrain suddenly and pull back onto the ridge top and catch people by surprise even on the flat ground above the slope. Even small cornices can have enough mass to be destructive and deadly. Cornice Fall can entrain loose surface snow or trigger slab avalanches.