Will skies be clear over southern Ontario Sunday night?
Partly clear skies seem likely, except for more cloudiness southeast of Lake Huron and Georgian Bay due to lake-effect cloudiness flowing downwind from the warm waters (illustrated below for low-level moisture at the 850 hPa level). Elsewhere, skies are likely to become partly clear due to diminishing mid-level moisture during the early evening (illustrated below for the 700 hPa level) although another region of mid-level moisture is forecast to move southeastward across southern Ontario after midnight and could cause increasing mid-level cloudiness (over regions that are not under low-level lake-effect cloudiness).