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 20th, 2015–Feb 21st, 2015

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

Regions

Little Yoho.

The main concerns at Treeline and above will be the recent cornices and wind scoured shallow spots from last week's storm. Watch for overhead hazard. Cornices are huge triggers and it is important to keep in mind with abrupt temperature fluctuations.

Weather Forecast

A upper ridge of high pressure will build back in over the weekend and stick around for the remainder of the week. Cold temps will emerge Saturday morning and then temperatures will moderate shortly afterwards. Light to no precipitation and light winds for the beginning of next week.

Snowpack Summary

The snowpack is a mix of surfaces and depths. Deep facetted weaknesses may be present in isolated locations at TL and above where the snowpack is exposed to the wind and sun. From treeline down, breakable melt-freeze crust transitions to bullet proof melt-freeze crust. The skiing is rugged below 2100 meters so expect challenging conditions.

Avalanche Summary

No new avalanches were reported today in Little Yoho.

Confidence

The weather pattern is stable on Saturday

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.

Deep Persistent Slabs

Deep Persistent Slab avalanches are the release of a thick cohesive layer of hard snow (a slab), when the bond breaks between the slab and an underlying persistent weak layer deep in the snowpack. The most common persistent weak layers involved in deep, persistent slabs are depth hoar or facets surrounding a deeply buried crust. Deep Persistent Slabs are typically hard to trigger, are very destructive and dangerous due to the large mass of snow involved, and can persist for months once developed. They are often triggered from areas where the snow is shallow and weak, and are particularly difficult to forecast for and manage.