Avalanche Forecast
Issued: Feb 2nd, 2019 3:51PM
The alpine rating is Wind Slabs and Deep Persistent Slabs.
, the treeline rating is , and the below treeline rating is Known problems includeSummary
Confidence
High -
Weather Forecast
The snow will taper as the cold air moves in. Only a few more cm's expected. The cold will creep in overnight tonight with morning lows of -32. Winds will swing to the south and become light. It will probably be cloudy tomorrow, but with temps like that, don't be surprised if it clears.
Avalanche Summary
At Tryste Lake today we were able to trigger a sz2 by dropping a very small cornice chunk on the slope. It pulled out the storm snow and ran to the lake. On the commonwealth side, there was a natural sz2 storm slab at treeline on a north aspect. If I was a betting man, I'd bet the farm on there being a medium size natural cycle today throughout the area that went unnoticed because of the poor visibility.
Snowpack Summary
35-45cm of new snow has fallen in the last 24hrs. With the warm temps during the storm the snow was quick to settle and in many areas formed a soft slab almost immediately. Today we had reactive soft slabs from 2200m up. The winds also played a role in open areas at all elevations. Touchy windslabs are present at treeline and alpine on easterly aspects. What these slabs rest on is important. On north aspects the old slabs were dense with some surface facetting. On south aspects the Jan 28 sun crust is down 40cm. Both of these older layers are a poor bonding surface for the new snow. To add another variable, the Jan 17 surface hoar layer is also present. It's been hard to nail down the details of this layer, but keep an eye out for it below 2200m sheltered areas. The deeper layers are also adjusting to the new load. While not reactive today, don't forget about them and remember that they are gradually getting used to the new snow load.
Problems
Wind Slabs
Aspects: All aspects.
Elevations: All elevations.
Likelihood
Expected Size
Deep Persistent Slabs
Aspects: All aspects.
Elevations: Alpine, Treeline.
Likelihood
Expected Size
Valid until: Feb 3rd, 2019 2:00PM