Avalanche Forecast
Issued: Feb 11th, 2020 4:00PM
The alpine rating is , the treeline rating is , and the below treeline rating is Known problems include Wind Slabs.
ghelgeson,
Avalanche Canada
Watch for wind loaded pockets, especially around ridgecrest and in extreme terrain. Caution with travel around cornices too, best to give them a wide berth.
Summary
Confidence
High -
Weather Forecast
Aside from a few bouts of potentially strong wind, we continue to be in a rather benign weather pattern at least until Sunday when there is a hint of another storm...
TUESDAY NIGHT: Freezing level at valley bottom, moderate north/northwest wind, 1 to 5 cm of snow possible.
WEDNESDAY: Scattered cloud cover initially with clearing expected in the afternoon, freezing level near valley bottom, light variable wind, trace of precipitation possible.
THURSDAY: A few clouds at dawn building to overcast by sundown, freezing level rising to around 1300 m in the afternoon, moderate to strong southwest wind, trace of precipitation possible.
FRIDAY: Scattered cloud cover, freezing level rising to around 1300 m in the afternoon, moderate to strong west/southwest wind, trace of precipitation possible.
Avalanche Summary
On Monday control work produced a cornice failure from a northeast facing ridge, a couple of size 2 wind slabs on a northwest facing feature at 2000 m and small stubborn wind slabs to size 1. Â
On Sunday no new natural avalanches were reported but smaller wind slab avalanches to size 1.5 were human triggered on northeast facing features around 1900 m with an average depth of 25 cm.
On Saturday storm slab avalanches to size 2 were widespread. They ran naturally and were intentionally triggered by avalanche control work on all aspects. Â
Fragile cornices and one large cornice fall have been reported over the past 10 days.
Snowpack Summary
The weekend storm produced 15 to 25 cm of warm storm snow. This snow has been formed into slabs in wind exposed terrain by previously strong winds that were largely out of the northeast. This snow rests on previously wind affected snow and a thick rain crust that exists up to roughly 2100 m. In many areas this capping crust extends to mountaintops. Sheltered areas now have 15-30 cm of snow above the crust. The bottom 20 cm of the snowpack consists of basal facets and decomposing crusts that have not been an active avalanche problem since December, but could reemerge as a problem after sustained warming.
Terrain and Travel
- Caution around slopes that are exposed to cornices overhead.
- Small avalanches can have serious consequences in extreme terrain. Carefully evaluate your line for wind slab hazard before you commit to it.
Problems
Wind Slabs
Wind slabs have formed above a widespread crust. These wind slabs are growing resistant to human triggering as they age but could still be a problem, especially in steep terrain immediately lee of ridge crest as well as bigger more extreme terrain features.
Aspects: North, North East, East, South East, South.
Elevations: Alpine.
Likelihood
Expected Size
Valid until: Feb 12th, 2020 5:00PM
