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Avalanche Forecast

Archived

Jan 18th, 2019–Jan 19th, 2019

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

Regions

North Columbia.

Storm snow may not bond well to underlying crusts and surface hoar. It is a good day to dial back your terrain choices.

Confidence

Moderate - Intensity of incoming weather systems is uncertain on Saturday

Weather Forecast

FRIDAY NIGHT: Cloudy with scattered flurries, snow accumulation of 5 cm, moderate to strong winds from south, alpine temperature -6 C, freezing level at 900 m.SATURDAY: Periods of snow, accumulation ranging from 5 to 10 cm, moderate to strong southwest winds, alpine temperature -5 C, freezing level at 1300 m.SUNDAY: Cloudy with sunny periods and isolated flurries, light to moderate west winds, alpine temperature -8C, freezing level at 900 m.MONDAY: Mainly cloudy with isolated flurries, light to moderate winds from west, alpine temperature -10 C, freezing level at valley bottom.

Avalanche Summary

A few natural and skier-triggered wind slabs avalanches size 1.5 to 2 were reported Tuesday on steep north and northeast slopes in the alpine and at treeline.

Snowpack Summary

Snowfalls continuing overnight Friday and Saturday will lead up to a total of 15 to 25 cm.  This new snow is accumulating over a variety of surfaces including a sun crust on solar aspects at treeline and above, faceted dry snow on north aspects and surface hoar up to 15-20 mm developed in sheltered and shaded areas at all elevation.  Wind slabs are also developing on north aspects in the alpine and at treeline.The middle and lower portions of the snowpack are generally well-settled and strong.

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.