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.