Will skies be clear over southern Ontario Sunday night?
Partly clearing skies are likely later in the evening, after jetstream-level cloud moves eastward (illustrated below for mid-evening), except for lots of low clouds near GTA and Lake Ontario due to low-level moisture (illustrated below for early and mid-evening). Then, before morning, increasing cloudiness is likely due to more low-level moisture which is forecast to move over most regions of southern Ontario before morning.