Will skies be clear over southern Ontario Tuesday night?
Mostly clear skies are likely, except for scattered low clouds that are likely to appear over most regions, remaining from the moisture that has been over southern Ontario during the past several days. Also, fog is likely to form over some regions during the early morning because the dewpoint (and moisture content) of the low-level air is not likely to decrease much today and overnight. Another consequence of the humidity (besides fog patches) will be dew formation on optical surfaces exposed to the clear night sky.