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Avalanche Forecast

Archived

Nov 9th, 2021–Nov 10th, 2021

Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.

Regions

Little Yoho.

Recent inputs of snow and wind are likely increasing the avalanche hazard in the alpine. We have few observations beyond the ski hills, so it is uncertain how prevalent these problems are.

Weather Forecast

5-10cm is expected along the divide Tuesday night into Wednesday AM. Along the foothills only a trace of snow is expected. Strong winds (50-60kmh) at 3000m are forecast, and light at valley bottom. Expect alpine temperatures -10 to -15C. Thursday is looking like diminished winds, and no new snow with colder temperatures.

Snowpack Summary

2-5cm over the last 24 hours. Up to 25cm of snow has accumulated over the last 5 days in the alpine. This sits over a melt freeze crust that may be present to ~2500 m. Below the crust is 10-30cm of facetted snow , increasing to 60-70cm in the alpine. Generally below threshold for avalanches at treeline and below.

Avalanche Summary

We have very limited observations. Lake Louise ski hill avalanche staff ski cut some small cornices, triggering multiple avalanches up to size 1.5. They were 40- 50m wide, and were on average 40cm deep (60cm in spots). Their main comment was that the slabs were digging down to the rocks, and being in one of those would be very bad due to this.

Confidence

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.

Loose Dry

Loose Dry avalanches are the release of dry unconsolidated snow and typically occur within layers of soft snow near the surface of the snowpack. These avalanches start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-dry avalanches include point-release avalanches or sluffs.