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Avalanche Forecast

Archived

Jan 6th, 2018–Jan 7th, 2018

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

Regions

Northwest Coastal.

Uncertainty exists with forecast amounts of snow: Adjust your terrain use to match the storm snow totals in your area.

Confidence

Moderate - Timing, track, or intensity of incoming weather system is uncertain

Weather Forecast

We'll see a return to a more seasonal active weather pattern, with modest amounts of snow by Monday afternoon.  SUNDAY: Snow. 10-15 cm accumulation / Moderate south wind / Alpine temperature -3 / Freezing level 600mMONDAY: Snow. 10-15 cm accumulation / Moderate south west wind / Alpine temperature -2 TUESDAY: Isolated flurries / Moderate north west wind / Alpine temperature -4

Avalanche Summary

In the south of the region, recent avalanche activity has been reported as thin storm slab avalanches to size 1 along with isolated wind slab avalanches on east aspects in the alpine and at tree line.

Snowpack Summary

In the south of the region, recent warming, some rain/freezing rain and daily snowfall of 5 -10 cm has begun to build a thin storm slab. Above tree line the new snow has been redistributed by primarily south - west winds. There are some lingering wind slabs, found on a variety of old surfaces including a thick melt-freeze crust that formed in mid-December. In the north of the region there has been 20-40cm of storm snow since New Year's eve, with moderate to strong southerly winds. Warming temperatures and forecast snow are expected to form touchy storm slabs at all elevations. Danger ratings in the north of the region are likely one step higher than listed on the main page. Beneath the mid-December crust the snowpack is reported to be generally strong with the possible exception of areas around Stewart and northern parts of the region where the late-October, basal crust can be found near the base of the snowpack. Weak sugary faceted snow may exist around this deeply buried crust and could be triggered from shallow snowpack areas.

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.