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Avalanche Forecast

Archived

Nov 23rd, 2015–Nov 24th, 2015

Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.
Alpine
Below Threshold.
Treeline
Below Threshold.
Below Treeline
Below Threshold.

Regions

Purcells.

This bulletin is based on limited observations. Conditions vary greatly across the region so take the time to gather information about the snowpack as you travel. We always appreciate any observations from your day submitted to the MIN.

Weather Forecast

Total snowfall from this storm should range between 2 and 15cm with the northern portion of the forecast region receiving the most snowfall. Moderate to strong SW winds are expected to continue through Monday evening. Very cold air descending from the Arctic will lead to clearing skies and cold temperatures for the next few days. For detailed mountain weather information visit avalanche.ca/weather

Avalanche Summary

We're working with very limited observations at the moment and we have not received any reports of recent avalanche activity.

Snowpack Summary

Monday's storm snow has fallen on a variety of old surfaces including crust, surface hoar and old settled snow. In the southern portion of the region MIN reports suggest that a surface crust can be found up to 2200m. The current state of the snowpack is a bit complex, in the upper 100cm you're likely to find one or more surface hoar layers and maybe a crust or two. Facets may exist just above the ground on shaded slopes in the alpine.

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.

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.