Will skies be clear over southern Ontario Thursday evening?
Mostly clear skies are likely over most regions, except for some mid-level cloudiness during the evening over regions from the GTHA westward and north of Lake Erie, due to mid-level moisture which is forecast to be over these regions during the evening (illustrated below on the charts for 500 and 700 hPa levels). Also, some jetstream-level clouds may be visible over most regions, due to the jetstream south of Ontario and jetstream-level  moisture moving over most of southern Ontario overnight (illustrated below for late evening).