Avalanche Forecast
Issued: Jan 5th, 2020 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
ahanna,
Avalanche Canada
Windslab formation has been extensive and can be found in open areas at all elevations. Avoid fat looking pockets of snow in lee features.
Summary
Confidence
Moderate - Uncertainty is due to difficult to forecast freezing levels. Uncertainty is due to the track & intensity of the incoming weather system.
Weather Forecast
Sunday night: 5-10 cm of snow, moderate wind from the southwest, alpine low temperature -9 C, freezing level valley bottom.
Monday: Cloudy with sunny periods, then up to 5 cm of snow starting in the pm, moderate wind from the southwest, alpine high temperature -7 C, freezing level valley bottom.
Tuesday: 10-20 cm of snow turning to rain below 1300 m in the evening, light wind from the southwest, alpine high temperature -3 C, freezing level 1000 m rising to 1500 m.
Wednesday: 5-10 cm of snow with light rain below 1300 m, light wind from the southwest, alpine high temperature +1 C, freezing level 1500 m.
Avalanche Summary
Natural storm and wind slab avalanche activity up to size 1.5 was observed Friday and continued on Saturday, up to size 2. At least one of these was triggered by a natural cornice fall.
We are sorry to report the news of 2 fatalities in the Montana Flathead region last Wednesday. The bed surface of the deadly avalanche was a crust formed and buried around Christmas. An illustrated photo can be found here. This crust has been observed widely in the Lizard Flathead region as well, and was associated with a large natural storm slab avalanche cycle around the time of the fatalities.
Snowpack Summary
Recent snow has been blown into wind slabs in open areas at all elevations and cornice growth in the alpine has been notable.Â
Several crusts layers have formed in the mid to upper snowpack as a result of recent warming and rain events. As these crusts become buried deeper, they have the potential to turn into a persistent slab problem. We'll be keeping an eye on them going forward.Â
The lower snowpack consists of weak faceted snow and decomposing crusts but has not been an active avalanche problem recently.
Terrain and Travel
- Be careful with wind loaded pockets, especially near ridge crests and roll-overs.
- Keep your guard up at lower elevations. Wind slab formation has been extensive.
Problems
Wind Slabs
Windslab formation has been extensive, including in open areas below treeline.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Valid until: Jan 6th, 2020 5:00PM
