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Avalanche Forecast

Archived

Apr 21st, 2019–Apr 22nd, 2019

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.

Avalanche activity has decreased but a few new natural and skier triggered avalanches were observed Sunday. Continue to treat big slopes carefully and watch for the effects of daytime heating on the snowpack later in the day. Start and finish early!

Weather Forecast

Cool temperatures with freezing levels at valley bottom are expected Sunday night. Monday the SW winds begin to increase to moderate or strong by the end of the day. Clouds will start building later in the afternoon and up to 5 cm of new snow is expected in the evening. Freezing levels will rise to around 2200 m and remain high into Tuesday.

Snowpack Summary

20-50 cm of snow from Thursday and Friday continues to settle and is beginning to bond to the underlying surfaces of crusts, facets and storm snow, but weaknesses are still present. Moist snow at lower elevations and on solar aspects later in the day. Snowpack depths have reached seasonal highs above 2000 m on N aspects. Still wintery up there!

Avalanche Summary

Sunday we saw continued evidence of the widespread natural and skier triggered avalanche cycle up to size 3 on most aspects above 2000 m. A couple new natural and skier triggered avalanches were observed though activity has slowed down. Still some sluffing on steep N aspects, loose wet on steep solar aspects and several recent cornice failures.

Confidence

Problems

Storm Slabs

Storm Slab avalanches are the release of a cohesive layer (a slab) of new snow that breaks within new snow or on the old snow surface. Storm-slabs typically last between a few hours and few days (following snowfall). Storm-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 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.