Will skies be clear over southern Ontario Monday night?
Skies will become cloudy after midnight in most regions (ahead of a low pressure trough which is forecast to move over southern Ontario during Tuesday), and might be clear during Monday evening except for a significant amount of cloud moving over southwestern Ontario during the afternoon associated with a weather disturbance that is moving eastward across the southern Great Lakes region (shown below on satellite image). The cloud may dissipate and allow skies over some regions of southern Ontario to remain partly clear during the evening, or the cloud may remain thick and opaque and cause cloudy skies by evening.