On shady aspects, there is a layer of weak near-surface facets developing. These could become a problem if they get buried by new snow this weekend. On sunny aspects, the snow surface is getting wet and is becoming weak as it heats up in the afternoon.
In this photo, observe how both issues can occur on the same slope.
Photo: GNFAC
Location
Advisory Year
Forecast link: GNFAC Avalanche Forecast for Thu Mar 18, 2021