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Avalanche Forecast

Archived

Mar 22nd, 2020–Mar 23rd, 2020

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

Regions

Little Yoho.

New snow, wind and warmer temperatures will elevate the avalanche danger on Monday. Narrow gullies and steep rocky terrain may have small natural avalanches. Step back to more moderate terrain choices until the new snow has a chance to bond.

Weather Forecast

Snow is expected Sunday night and Monday with total amounts ranging from 10-15 cm depending on the elevation. Winds will increase into the moderate to strong range out of the SW on Monday before dropping down to light again on Tuesday. Freezing levels stay just above valley bottom and some areas could see rain at lower elevations on Monday.

Snowpack Summary

Widespread wind effect in the alpine and down into treeline. Sun crusts on solar aspects and buried sun crusts on steep solar aspects. In most areas of the Little Yoho region a deep snowpack exists with few weaknesses, though thin areas still have a weak facetted base.

Avalanche Summary

Several solar triggered small loose avalanches observed in the past several days and some skier triggered surface sluffing in steep terrain up to size 1.5.

Confidence

Freezing levels are uncertain on Monday

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 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.