I’ve noticed the same here past hour .. skies brightening up as the winds picked up
If I had to guess its due to some lower level dry air being advected in
For marginal areas, you'd want the convection to really get going and get as organized as possible this afternoon .. would go a long way overnight to have a more uniform area of big lift as opposed to a more banded structure
maybe early jan 2020? Big ULL went south of us but in the dryslot there was thunderstorms with close to severe criteria hail in western ma / ct. IIRC it was sleeting at the time too.