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Avalanche Forecast

Archived

Nov 28th, 2020–Nov 29th, 2020

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

Regions

South Coast.

Wind loaded pockets at upper elevations may remain sensitive to human triggering Sunday. The next storm is forecast to trickle in late in the day.

Confidence

Low - Uncertainty is due to the limited number of field observations. Uncertainty is due to rapidly fluctuating freezing levels.

Weather Forecast

Saturday night: Clear, moderate southwest wind, freezing level 1100-1200 m.

Sunday: Cloudy with flurries starting in the afternoon, southwest wind building through the day, freezing level 1200-1800 m.

Monday: 20-30 mm precip overnight, strong northwest wind easing through the day, freezing level dropping 1200 m to 600 m.

Tuesday: Clear, light northwest wind, freezing level spiking 700m to above mountaintop late in the day.

Avalanche Summary

No recent reports of avalanche activity.

Our eyes and ears in the mountains are limited at this time of year and may continue this winter due to fewer professional observations. If you see anything (or don't) while out in the field, please consider sharing via the Mountain Information Network (MIN). Photos are especially helpful! A big thank you to those that have already shared their observations thus far.

Snowpack Summary

Previous southwest winds have formed thick slabs in lee features at upper elevations. 10-20 cm sits over a crust from a recent rain event. 

Snowpack depth rapidly changes with elevation. The snowline has been reported to be around 900 m. The snowpack rapidly jumps to around 100 cm deep above 1000 m and between 150 to 200 cm near the mountain tops.

Check out this awesome conditions update from North Shore Rescue from Friday.

Terrain and Travel

  • Be alert to conditions that change with elevation and wind exposure.
  • Be cautious of buried obstacles especially below treeline.

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.