Will skies be clear over southern Ontario Thursday evening?

It looks like a situation with gradually increasing high cloudiness over southern Ontario during Thursday afternoon and evening. Some regions may see mostly clear skies during some periods during the evening while other regions may be under thicker cloud. The moisture and cloud cover spreading eastward (ahead of a low pressure trough west of the Great Lakes region) will probably cause mostly cloudy skies by about midnight, but a significant result of the warmer air spreading across southern Ontario will be very steady seeing conditions during the evening. The result may be excellent conditions for viewing planets (as well as double stars), at least in the regions where and when the cloudiness is thin enough.  The cloud forecast chart below shows a good estimate of the gradually increasing cloud cover spreading eastward over southern Ontario.