Will skies be clear over southern Ontario Wednesday evening?
Most regions will probably see some cloudiness. Significant low-level moisture is forecast to be over southern Ontario during the evening, shown in the 850 hPa level moisture chart below, and this will cause low-level cloudiness over many regions during the evening, and this low-level cloudiness will tend to diminish later in the evening or after midnight. Also, some high-level moisture may appear as cirrus-level cloudiness if there are breaks in the low cloud cover. The high-level moisture is forecast to move south of southern Ontario overnight. So, cloudy skies are more likely during mid-evening and clear skies are more likely after midnight.