Those in the low 20s are likely still mostly/all sleet. Those climbing into the upper 20s have a little latent heat added at the surface. So a lot of times you can guesstimate the PL/ZR line where you see that low 20s/upper 20s gradient.
It’s mixing here and there. There’s some pings hitting the pellet stove pipe, but it’s mostly snow. I’m leaving the sleet on top so it’ll snowblow easier.
If I’m snowblowing down there I’d be tempted to wait until it’s over otherwise the driveway will be a skating rink. Definitely wait until it’s gone from sleet to zr. That sleet will sit there forever.