Quick report
Went looking to see if old snow exists in Hells Canyon starting zone. Couldn't find it below 8000 feet. By 8600 feet, we found it on a NNE facing slope. Profile and photo below from that location.
It's deeply buried and would be hard to trigger an avalanche on this layer; however, it's still totally possible, and I wouldn't trust it yet...espeically with the potential for 2 inches of water.
Photo below of a location at 7300 feet with no weak layer by the ground.
Snowpack
Snow surface has been worked by recent south winds. New snow with the incoming storm should bond well to the old snow surface. The main issue will be characteristics of the new snow and the potential for denser snow (due to wind or increasing temps) on top of lighter snow.