Will skies be clear over southern Ontario Thursday night?

Mostly clear skies are expected over most regions by about mid-evening, except for early-evening low cloudiness that is likely to dissipate by mid-evening, and except for increasing high cloud after midnight over southwestern regions.

Will skies be clear over southern Ontario Tuesday night?

Mostly or partly clear skies are likely during early evening over many regions, except for cloudiness over regions near and east of Lake Huron and Georgian Bay. High cloud will likely appear by mid-evening, followed by increasing cloudiness.

Will skies be clear over southern Ontario Monday night?

Partly or mostly cloudy skies are expected over most regions, due to moisture and cloudiness flowing southeastward from Lake Huron and Georgian Bay, but skies may occasionally become mostly clear over some regions.

Will skies be clear over southern Ontario Tuesday night?

Mostly cloudy skies are expected over most regions during early evening, due to low-level moisture flowing southeastward from Lake Huron and Georgian Bay (illustrated below for early evening) except for mostly clear skies over southwestern regions south of Lake Huron, until increasing moisture and cloudiness moves eastward over southern Ontario after midnight.

 

Will skies be clear over southern Ontario Thursday night?

Mostly cloudy skies are expected over most regions, except for mostly clear skies over regions near and east of GTA during early and mid-evening until some high cloudiness moves over these regions, caused by jetstream-level moisture which is forecast to move eastward over southern Ontario overnight. Some patches of low cloud are also likely to move over some regions during the evening.

Will skies be clear over southern Ontario Sunday night?

Cloudy skies are expected, except for clearing skies developing after midnight near and east of the Peterborough area, due to mid-level moisture moving eastward (illustrated below for 1 am EST in the 500 hPa moisture chart) and general diminishing of low-level cloud near the Peterborough region, well north of Lake Ontario, and south of the downwind edge of southern Georgian Bay (illustrated below for 1 am EST in the 925 hPa moisture chart). At the same time, high cloud is likely to be increasing, due to jetstream-level moisture moving northeastward across southern Ontario (illustrated below for 1 am EST in the 300 hPa moisture chart) (and the jetstream-level moisture doesn’t give a hoot about topographical effects like big warm lakes).