Dashboard Regions Weather Stations Radar Alerts Glossary
Contact About
Log In

Register for an account and never miss a forecast again!

Register

Avalanche Forecast

Archived

Nov 21st, 2015–Nov 22nd, 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

Cariboos.

Given the very limited information on hand for this bulletin, I would travel cautiously this weekend and take the time to gather snowpack information as I go. As always, we would love for you to submit any observations from your day to the MIN.

Confidence

Poor - Due to the number and quality of field observations

Weather Forecast

An advancing cold from the North brings cooler temperatures accompanied by isolated flurries on Sunday with moderate snowfall forecast for Monday. Sunday: Mainly clear, freezing levels falling to the valley floor and light flurries throughout the day. Monday: 5 to10 cm of snow with westerly wind, a high of -10 in the alpine. Tuesday: 5 to 10 cm of snow, westerly wind, a high of -15 in the alpine.

Avalanche Summary

I’m working with limited observations but there haven’t been any reports of avalanche activity.  However, the avalanche cycle that occurred during and immediately after the storm earlier in the week produced some large deep avalanches.

Snowpack Summary

Up to 50cm of new snow fell in the last week. Below this new snow were dealing with a complex snowpack. Changes in wind, freezing levels and snowfall amounts mean that conditions could be dramatically different depending on aspect and elevation. Layers of buried surface hoar or crusts may be found depending on where you dig. It would be wise to test these layers before committing to a slope. At higher elevations in the alpine, facets may be found above the ground, especially on north aspects. Remember that although it's starting to look like winter, its still a young snowpack. Rocks and stumps may be lurking unseen just below the surface. Ride with care!

Problems

Wind Slabs

Wind Slab avalanches are the release of a cohesive layer of snow (a slab) formed by the wind. Wind typically transports snow from the upwind sides of terrain features and deposits snow on the downwind side. Wind slabs are often smooth and rounded and sometimes sound hollow, and can range from soft to hard. Wind 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.