Look for signs of instability like natural avalanches, whumpfing and shooting cracks. Wind slabs at treeline could have formed over touchy surfaces like crusts and surface hoar making them larger and more sensitive to triggering.
Recent snow has likely been redistributed by southwest winds forming wind slab. In Sheltered areas at treeline these wind slabs could overlie a layer of surface hoar. Triggering a wind slab in this type of terrain could result in a larger and more destructive avalanche.
No new avalanches have been observed or reported in this region. However, note that we have had very few field observations. Please consider filling out a Mountain Information Network report if you are heading to the backcountry.
Recent new snow, about 20cm, has been redistributed by westerly winds forming wind slab. On south facing slopes this new snow has fallen on a sun crust and in sheltered terrain it sits over a layer of surface hoar.
Buried 30 to 50cm deep, a layer of surface hoar, crust, and faceted crystals is the persistent layer of concern. Observations are limited in this region but this layer has already produced avalanches in the neighboring regions.
Snowpack depths at upper treeline are generally less than a meter.
Thursday Night
Trace amounts of new snow expected. Moderate southwest winds with a low of -10 at 1800m.
Friday
Mostly cloudy with a trace of new snow expected. Light to moderate southwest winds with a high of -8 at 1800m.
Saturday
Cloudy with up to 5cm of new snow. Moderate southerly winds in the morning becoming light in the afternoon. High of -7 at 1800m.
Sunday
A mix of sun and cloud with no new snow expected. High of -5 at 1800m. Light winds.
More details can be found in the Mountain Weather Forecast.
