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Avalanche Forecast

Archived

Jan 23rd, 2014–Jan 24th, 2014

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

Regions

Little Yoho.

The hazard is Moderate, but forecasters still have lowered confidence in the overall strength of the snowpack, especially in thin areas. SH

Weather Forecast

Expect an above freezing layer to develop Friday at upper elevations. Alpine temperatures may be close to zero until Sat. night with light Northerly winds. No precipitation is forecast for the next 2 days.

Snowpack Summary

The midpack is slowly strengthening. Sudden collapse compression results still found, failing at the base in old DH and on top of the crust in the hard range. Some moist snow in the afternoons on steep, solar aspects forming thin sun crusts overnight. Wapta Icefields snow cover reported as highly variable, ranging from 20cm-2m over the ice.

Avalanche Summary

No new avalanches observed.

Confidence

Freezing levels are uncertain on Friday

Problems

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.

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.