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Archived

Avalanche Forecast

Feb 1st, 2019–Feb 2nd, 2019
Alpine
3: Considerable
The avalanche danger rating in the alpine will be considerable
Treeline
3: Considerable
The avalanche danger rating at treeline will be considerable
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate
Alpine
2: Moderate
The avalanche danger rating in the alpine will be moderate
Treeline
2: Moderate
The avalanche danger rating at treeline will be moderate
Below Treeline
2: Moderate
The avalanche danger rating below treeline will be moderate

Regions: Kootenay Boundary.

Fresh storm slabs are primed for human triggers. Use small slopes without consequence to test the bond of the new snow.

Confidence

Moderate - Forecast snowfall amounts are uncertain

Weather Forecast

FRIDAY NIGHT: Snow; 15-25 cm. / Moderate to strong, southwesterly winds / Low -3 / Freezing level valley bottom.SATURDAY: Cloudy / Light, southwesterly winds / High -3 C / Freezing level valley bottom.SUNDAY: Mostly cloudy / Light, southwesterly winds / High-5 C / Freezing level below valley bottom.MONDAY: Mix of sun and cloud / Light, northwesterly winds / High -14 C / Freezing level below valley bottom.

Avalanche Summary

No avalanches were reported in the region on Thursday. However, fresh storm slabs reactive to human triggers will likely form Friday night.

Snowpack Summary

15-20 cm of new snow has covered a wide variety of snow surfaces. Sun crusts on south aspects to mountaintops, some of which have small surface hoar(weak, feathery crystals) growing on top, which is a particularly nasty combination. Most exposed alpine areas have been heavily wind effected. 5-10 mm surface hoar has been widespread in areas that are protected from sun and wind.Around 20 to 40 cm down, expect to find a crust on south aspects and feathery surface hoar crystals in sheltered and shaded areas. The surface hoar is currently the primary layer of concern and may be most reactive at treeline elevations on shady aspects. However, no recent avalanches have been reported on this layer.The remainder of the snowpack is generally well-settled and strong in most locations.

Avalanche Problems

Storm Slabs

Fresh storm slabs will form on a variety of surfaces and will be primed for human triggers. Start in simple terrain while you test the bond of the new snow.
Use small slopes without consequence to test the bond of the new snow.Stay alert to changing conditions with elevation.Watch for whumpfing, hollow sounds, shooting cracks or recent avalanches.

Aspects: All aspects.

Elevations: All elevations.

Likelihood: Likely

Expected Size: 1 - 2

Persistent Slabs

40-60 cm of snow sits above crusts and a weak layer of surface hoar. The surface hoar is likely most pronounced in shaded and sheltered areas at treeline.
Avoid large slopes that would have big consequence if this deeper layer was triggered.Smaller storm slab avalanches in motion could 'step-down' and trigger this layer.

Aspects: North, North East, East, West, North West.

Elevations: Treeline, Below Treeline.

Likelihood: Unlikely - Possible

Expected Size: 1 - 2