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Avalanche Forecast

Archived

Nov 24th, 2019–Nov 25th, 2019

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

Regions

Northwest Coastal.

Venture cautiously as you investigate the outcome of the storm. Use this forecast as an initial assessment and gather information as you travel.

Remember to post your observations to the Mountain Information Network!

Confidence

Low - Uncertainty is due to the limited number of field observations.

Weather Forecast

Sunday night: Isolated flurries bringing a trace to 5 cm of new snow. Moderate northwest winds.

Monday: A mix of sun and cloud. Light to moderate northwest winds. Alpine high temperatures around -7.

Tuesday: Mainly sunny. Light to moderate northeast winds increasing over the day. Alpine high temperatures around -9, cooling over the day.

Wednesday: Sunny. Moderate northeast winds. Alpine high temperatures around -15.

Avalanche Summary

Observations from the succession of storms that impacted the region have yet to come in, but it is expected that the significant load of new snow (along with strong winds) promoted widespread natural storm slab avalanches at elevations where snow accumulated instead of rain.

Looking forward, clearing weather is likely to make travel in the mountains a more inviting prospect, however this is a time to be on high alert in any areas where new snow buried a smooth surface. Concern is reduced in areas where the new snow hasn't yet overcome the depth of ground roughness.

Snowpack Summary

No post-storm observations have yet been reported, but it is expected that heavy rain over Friday and Saturday gave us light new snow amounts below the alpine as temperatures cooled while possibly adding a metre or more of new snow to alpine areas - thereby tripling recently observed snowpack depths at higher elevations. 

A heavy coastal focus was noted in precipitation amounts, with 157 mm of rain recorded at Shames and only 36 mm at Rosswood.

Beyond the sheer quantity of new load in more coastal alpine areas, the bond between the new snow and the melt-freeze crust on the previous surface is expected to be poor, particularly in areas that did not experience rain in advance of the recent snowfall (higher elevations).

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.