Avalanche Forecast
Issued: Dec 3rd, 2019 8:23AM
The alpine rating is Storm Slabs, Loose Dry and Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeA natural avalanche cycle will peak this afternoon as strong winds trigger storm slabs!
Summary
Weather Forecast
Today: 15-20cm of new snow, winds will be light to moderate possibly gusting strong this afternoon out of the South, and the freezing level should stay below valley bottom (VB). Tonight: Another 10cm, winds increasing from the SW, and temps staying cool with the FL staying well below VB. Flurries for Wednesday, and a clearing trend on Thursday
Snowpack Summary
30 of new snow covers a facetted upper snowpack and previously wind affected surfaces. The two main interfaces to watch for are the storm slab interface down 30cm+ and the Nov 23rd surface hoar/ crust buried 40-60cm. Multiple buried crusts exist lower in the snowpack, but recent profiles are showing no significant shears on stability tests.
Avalanche Summary
We should see a natural avalanche cycle today with the 20cm of new snow that fell last night, plus another 15cm forecasted today! No new avalanches were reported from the highway or the backcountry yesterday; however, we are already starting to see some activity in the Highway corridor this morning!
Confidence
Problems
Storm Slabs
30cm + of new snow in the last 24 hours, and another 15cm of forecasted snow will form storm slabs in the Alpine and at Treeline. Winds are forecasted to increase this afternoon, which should spike today's avalanche cycle!
- Avoid exposure to overhead avalanche terrain, large avalanches may reach the end of run out zones.
- If triggered the storm slabs may step down to deeper layers resulting in large avalanches.
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Loose Dry
The new snow will struggle to bond to the old surface layers and sluff easily in steep terrain. Loose dry avalanches can gain mass and potentially trigger storm slabs and or persistent slabs.
- Avoid terrain traps, such as gullies, where the consequences of a small avalanche could be serious.
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Persistent Slabs
Storm slabs have the potential to step down to a buried weak layer (Nov 23 Surface Hoar) now down 45-65cm. It consists of surface hoar at treeline and below, and a crust on steep solar aspects into the alpine.
- Dig down to find and test weak layers before committing to a line.
Aspects: All aspects.
Elevations: Treeline.
Likelihood
Expected Size
Valid until: Dec 4th, 2019 8:00AM