A warm blast of air is heading our way Wednesday, and natural avalanche activity will peak with its arrival.
If you are out for a tour, tree-bombs and snow pillows popping off steep features will indicate tropical air is flowing through.
New, warm snow is falling on low density fluff. Steep glades and confined gullies will likely have loose sluffing, especially with human traffic.
Watch out for tree wells!
Warm snowfall and winds have created storm slabs at all elevations. With warm temps peaking midday Wed, they will be particularly touchy to human triggers.
The storm severity has been downgraded, but the warming temp spike is still forecasted.
Tonight: Flurries, 5cm, Alp low -5*C, mod SW winds
Wed: Snow, 20cm, Alp high 0*C, fzl rising to 1800m, strong gusty SW winds
Thurs: Flurries, 10cm, Alp high -1*C, fzl 1700m, mod/gusting strong W winds
Warming temps, mod/strong SW winds, and ~15cm of new snow are combining with 60cm of low density snow to form new storm slabs. The Dec 1 crust (now buried up to 2m deep) remains dormant, despite having weak, sugary, faceted snow above and below it. The mid-lower snowpack is settled and strong.
We are in a natural avalanche cycle Tues afternoon, with numerous avalanches observed reaching out to their valley bottom fans from MacD and Tupper.
A natural sz3 avalanche from steep, unskiable terrain on Macdonald Tues morning made it the hwy, temporarily closing the road. Artillery control is on-going as the bulletin is being published.
