Above 2,500ft Moderate
1,500 to 2,500ft Moderate
Below 1,500ft Moderate
Degrees of Avalanche Danger ?
North winds will be very strong above treeline Friday-Sunday, causing fresh wind loading on lee aspects and terrain features/gullies. The good news is that our snowpack is re-frozen and hard, which will limit the amount of snow available for wind transport. Variability will be high, and any slopes with slabby layers near the top of the snowpack need to be treated with caution. Slopes with fresh or active wind loading and 30 degrees or steeper should be avoided. Please send in any observations.
Recent Avalanche Activity
There were isolated areas of wet and dry loose slides coming down from steep/cliffy terrain, mainly on sun-affected slopes. None of this activity was large, and occurred during warm temperatures earlier this week.
Our last two snowfalls consisted of 6-12″ on Dec. 27th, and again on the 29th. The first storm produced cold, dry snow that made a weak base for the wetter, heavier snow that fell on the 29th. Temperatures above the inversion were quite warm this week: 38-45F all the way to 6000ft.
Cold and very windy weather is coming in Friday-Sunday. Temperatures will drop into the single digits, and north winds will be blasting over ridgetops at 40-80mph.
Additional Info & Media
With very strong winds, expect unusual patterns of wind loading. This means areas lower down a slope, like mid-path and well below starting zones may accumulate pockets of dangerous wind slab. Expect a lot of variability out there and be ready for surprises.
Check our weather station page for live info from Sea to Summit:
2017 New Year’s resolution – develop backcountry habits to LIVE TO RIDE ANOTHER DAY:
- everyone is my riding group has a functioning beacon, probe, and shovel (& floatpack)
- my group chooses to avoid slopes with rocky trigger points
- my group chooses to avoid slopes with terrain traps; cliffs, gullies, and creek ravines
- my group agrees that one rider on a steep slope at a time is what we do
- my group gathers out of harm’s way, beyond the run-out
- my group reviews our day – where could we have triggered a slide? how can we improve our plan?