Will skies be clear over southern Ontario Tuesday night?
Lots of mid-level clouds will probably be visible during the evening over most regions, except over far southwestern regions, where mostly clear skies are likely, and then more extensive cloudiness is likely to spread over most regions by late evening or midnight ahead of an upper-level disturbance which is forecast to move southeastward across southern Ontario overnight. Regions that have partly or mostly clear skies during the evening will have jetstream-level moisture overhead which may cause some high, thin jetstream-level clouds to be visible.