Will skies be clear Wednesday night over southern Ontario?

It looks like very clear skies are likely during the evening, and generally clear skies from approximately sunset until morning twilight. After midnight, high cloudiness is likely to appear, especially west of the Toronto area, due to high and mid-level moisture ahead of a warm front.

With the moon not rising until about 4 hours after sunset, skies are likely to be clear and dark during the early evening. Later, as winds diminish, fog may develop especially in lower-elevation locations. The forecast charts below (if they load onto the blog site correctly) show the very dry air at mid-levels (700 hPa level) that will result in clear skies during the evening, and the moisture at jetstream levels (250 hPa level) during the early morning that may result in some visible high-level cloudiness over southwestern Ontario after midnight and before dawn.