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Avalanche Forecast

Archived

Apr 10th, 2016–Apr 11th, 2016

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.

A good freeze is expected Sunday night before another hot day on Monday. Travel conditions should be good early in the day but plan to start early and be down early. Enjoy the spring skiing conditions!

Weather Forecast

Sunday night should see a reasonable overnight freeze but expect another warm day on Monday with freezing levels around 2400m. Light to moderate West winds may help keep the alpine snowpack a little cooler. Continued warm temperatures, moderate West winds and the possibility of a few light flurries for Tuesday and Wednesday.

Snowpack Summary

We are into a spring cycle for most of the Little Yoho area except in the high alpine. Dry snow exists only in high North facing terrain. Occasional pockets of deep instability may still be encountered and triggered from shallow locations during warm periods of the day.

Avalanche Summary

No new avalanche observed or reported on Sunday due to a good overnight freeze. Some snowballing at lower elevations.

Confidence

Problems

Loose Wet

Loose Wet avalanches are the release of wet unconsolidated snow or slush. These avalanches typically occur within layers of wet snow near the surface of the snowpack, but they may quickly gouge into lower snowpack layers. Like Loose Dry Avalanches, they start at a point and entrain snow as they move downhill, forming a fan-shaped avalanche. Other names for loose-wet avalanches include point-release avalanches or sluffs. Loose Wet avalanches can trigger slab avalanches that break into deeper snow layers.

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

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.