Will skies be clear over southern Ontario Monday night?
Skies are expected to be cloudy during the early evening, becoming partly cloudy about mid-evening, partly or mostly clear after midnight for about 2-3 hours, and then cloudy again before sunrise.
The overnight clearing is expected because mid-level moisture is forecast to move southward from southern Ontario after midnight (illustrated below for the hour after midnight) and then widespread low-level moisture is forecast to move over southern Ontario before dawn and cause low-level clouds over most or all regions.