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Avalanche Forecast

Archived

Nov 18th, 2020–Nov 19th, 2020

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

Regions

Glacier.

The saying "Patience is a virtue" captures the mindset we should try and employ. As temperatures cool, riding conditions will improve, and our Avalanche hazard will decrease.

Weather Forecast

It's still unseasonably warm out, but we should start to see a cooling trend over the next few days.

Today: A mixed bag with sunny periods and flurries, FL falling to 1500m, winds abating to moderate values from the South.

Tonight: 8cm, FL lowering to valley bottom.

Thursday: Flurries

Friday: 15cm of new snow.

Snowpack Summary

Continued warm wet conditions at Rogers Pass, with 10 more mm of rain down low and 10-15cm of new snow up high, accompanied by strong Southerly winds. The Nov 5th Crust complex is now buried 40-70cm depending on elevation, and has been most reactive so far at Treeline. Nov 5th crust exists on all aspects up to 2500m, and higher on steep solar asp.

Avalanche Summary

No new avalanches were observed yesterday in the Highway Corridor, or reported from the backcountry. Last weekend we had a skier accidental with a full burial up Connaught Creek, where the storm slab was initiated on the Nov 5th crust. If you observe an avalanche or notable conditions, consider sharing on the AvCan MIN site.

Confidence

Due to the number of field observations

Problems

Persistent Slabs

Persistent Slab avalanches are the release of a cohesive layer of snow (a slab) in the middle to upper snowpack, when the bond to an underlying persistent weak layer breaks. Persistent layers include: surface hoar, depth hoar, near-surface facets, or faceted snow. Persistent weak layers can continue to produce avalanches for days, weeks or even months, making them especially dangerous and tricky. As additional snow and wind events build a thicker slab on top of the persistent weak layer, this avalanche problem may develop into a Deep Persistent Slab.

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.