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

Feb 23rd, 2016–Feb 24th, 2016

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

Regions

Little Yoho.

We are on an improving danger trend with the current stable weather pattern, however forecasters confidence in the snowpack is still low with limited observations and many close calls in the last week in our neighbouring areas.

Weather Forecast

A very strong ridge is moving into the region bringing clear skies and light NW winds. Temperatures will remain cool but the sun effect will be strong. This ridge is expected to remain in place for most of the week. We will see good overnight freezes on Tues and Wed PM with less of a freeze and warmer temperatures on Thursday and Friday.

Snowpack Summary

The Jan 6th layer of surface hoar/facets is down 80 - 120cm at treeline. This layer is is gaining strength and producing hard to no result in tests. A layer down 50cm (Feb 11) contains surface hoar in isolated locations at treeline and is producing moderate results. Overall a well settled snowpack with a few isolated wind slabs in the alpine.

Avalanche Summary

No recent observations or reports from the Little Yoho area. Many recent avalanches in the last week in the neighboring Banff, Yoho & Kootenay bulletin region.

Confidence

Freezing levels are uncertain on Friday

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.

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.