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 3rd, 2017–Dec 4th, 2017

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

Regions

Lizard-Flathead.

Recent storm snow accumulations are up to 50 cm. Storm slabs may be reactive to rider triggers. With limited observations and a variable snowpack use a conservative approach to route selection and terrain with low consequence.

Confidence

Low - Due to the number and quality of field observations

Weather Forecast

Monday: Mix of sun and cloud. Alpine temperatures near -10 and freezing levels at valley bottom. Ridgetop winds light from the west.Tuesday: Cloudy with sunny periods. Alpine temperatures near -8 and freezing levels at valley bottom. Ridgetop winds light from the west.Wednesday: Mix of sun and cloud. Alpine temperatures high of 0 degrees with freezing levels at valley bottom. Strong alpine temperature inversion.Expect strong inversions in the alpine up to 3000 m by Thursday. For detailed information visit the Mountain Weather Forecast.

Avalanche Summary

On Sunday, avalanche control with explosives triggered numerous size 1 dry loose avalanches above 1900 m from northeast aspects. Reactive storm slabs and dry loose avalanches may persist through Tuesday. Please submit your observations this weekend to the Mountain Information Network. Give info, get info.

Snowpack Summary

Up to 50 cm of accumulated storm snow has fallen on the crust that formed a week ago. The buried crust is supportive and approximately 10 cm thick. It extends from 1600 m to mountain top elevations on all aspects. Lots of uncertainty exists with the new snow sticking to the crust. Winds are likely redistributing the new snow above treeline and possibly forming wind slabs on leeward slopes and terrain features. The average snowpack depth at treeline is 60-80 cm while a deeper snowpack exists 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.