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Avalanche Forecast

Archived

Jan 22nd, 2019–Jan 23rd, 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, human triggered possible.

Regions

Sea To Sky.

New snow and wind will mean that storm slabs are to be expected, and will likely be reactive to human triggering, especially in wind loaded areas.

Confidence

Moderate - Forecast snowfall amounts are uncertain

Weather Forecast

TUESDAY NIGHT - Snow, 15-25 cm / southwest winds, 30-40 km/h / alpine low temperature near -2 / freezing level 1100 mWEDNESDAY- Cloudy with sunny periods / northwest winds, 10-20 km/h / alpine high temperature near -1 / Freezing level 1200 mTHURSDAY - Mainly cloudy / northwest winds, 15-30 km/h / alpine high temperature near 0 / freezing level 1200 m / alpine temperature inversionFRIDAY - Cloudy with sunny periods / northwest winds, 10-20 km/h / alpine high temperature near +2 / freezing level 1200 m / possible alpine temperature inversion

Avalanche Summary

A few size 1 explosives triggered avalanches were reported in the region on Tuesday.Avalanche activity quieted down on Sunday, with humans and explosives triggering a few small (size 1) wind slabs in lee features at treeline and in the alpine. On Friday and Saturday, many small to large (size 1 to 2) slab avalanches within the storm snow were triggered naturally, by humans and with explosives. For examples, check out the MIN reports here and here.

Snowpack Summary

Another 20-35 cm of new snow fell between Tuesday morning and Wednesday morning. This brings total recent snowfall amounts to approximately 40-60cm. This new snow likely sits on a sun crust on south facing slopes and surface hoar (feathery crystals) in sheltered and shaded areas. Recent strong to extreme southerly winds will have redistributed the new snow, forming storm slabs. Expect to find deeper deposits of snow in wind loaded terrain.

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.