Will skies be clear over southern Ontario Wednesday night?

Lots of cloudiness will be over southwestern regions to the north of a storm system which is forecast to move eastward across the southern Great Lakes region overnight and to be near northern Ohio early Thursday. Some mid and high-level moisture will extend further northward over most regions of southern Ontario (illustrated below for late evening), and some regions may experience mostly clear skies especially during the evening, followed by a greater chance of high clouds after midnight.