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

Dec 6th, 2019–Dec 7th, 2019

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

Regions

Glacier.

We are in mid-storm conditions. Natural avalanches are likely. Avoid lingering in runout zones, as slides may reach the valley bottom today.

Weather Forecast

Moderate to heavy snow fall is expected in Rogers Pass today with up to 15cm of accumulation. Strong SW winds arrive this afternoon. Freezing levels rise to 1600m with an alpine high of -2.0. An arctic front will bring another 10cm of snow on saturday before a high pressure ridge builds later in the weekend.

Snowpack Summary

20 cm of low density snow fell overnight and sits atop 70cm of settling storm snow. Winds from the previous storm created slabs on lee alpine features which are now concealed by the new snow. The November 23rd surface hoar/crust layer is buried +100cm and remains reactive in stability tests. Tree wells are getting deeper and deserve extra caution.

Avalanche Summary

Natural avalanche activity tapered off yesterday, with only 2 solar triggered size 2.0 avalanches observed from steep rocky terrain. We are in another storm cycle and expect natural avalanche activity to pick today, especially once the forecasted SW winds arrive.

Confidence

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.