Will skies be clear Thursday night over southern Ontario?

It looks like partly or mostly clear skies are likely due to a northwesterly flow of dry and cold air over southern Ontario ahead of a high pressure ridge that is moving eastward over Ontario during Thursday. While middle and upper levels are dry, some moisture and lift in the lower levels may cause some low-level cloudiness over some regions. The very cold air flowing across Lake Huron (not completely ice-covered as seen on Thursday’s visible-wavelength satellite images) will likely result in some patches of low-level cloudiness over southern Ontario especially during the evening. The forecast chart below shows the wind streamlines flowing southeastward from Lake Huron across southern Ontario, and some regions of moisture that will most likely be visible as patches of cloud.