Will skies be clear over southern Ontario Wednesday night?

Clear skies are expected over most regions, except for some low-level clouds near western Lake Ontario during the evening until a region of low-level moisture moves southward from southern Ontario overnight (illustrated below for late evening). Some thin jetstream-level clouds might also be visible from time to time (due to the jetstream extending west-to-east across southern Ontario), and some low-level clouds are likely to develop south of Lake Huron before morning.

Will skies be clear over southern Ontario Tuesday night?
Cloudy skies are expected, except that partly cloudy skies are possible during the evening over some regions where breaks in the increasing mid-level cloudiness allow the brighter stars and planets to appear and give the impression of partly clear skies, particularly in urban areas where the increasing high-level thin clouds may not be apparent.

Will skies be clear over southern Ontario Monday night?

Mostly clear skies are expected, with several exceptions:

-some low-level clouds may be over the GTA and western end of Lake Ontario during early evening due to a region of low-level moisture (illustrated below for mid-evening)

-some jetstream-level cloud may be visible over southwestern Ontario during the evening due to the jetstream winds moving eastward over southern Ontario overnight (jetstream-level moisture illustrated below for early evening)

-some mid-level clouds may develop over some regions after midnight due to mid-level moisture which is forecast to move eastward over southern Ontario before morning, ahead of Tuesday’s low pressure trough over the Great Lakes region

Note, no new posts until Monday August 29.

Will skies be clear Tuesday night over southern Ontario?
Clear skies are expected, except for some mid-level cloudiness possible over eastern regions of southern Ontario during the evening due to some mid-level moisture (illustrated below for late evening) and except for increasing high-level cloudiness (as well as some possible low-level clouds) due to jetstream-level moisture which is forecast to move over southwestern regions after midnight and before sunrise.

Will skies be clear over southern Ontario Monday night?
Mostly clear skies are expected. Some mid-level cloud patches may appear, mostly over regions north of GTA, due to thin mid-level moisture which is forecast to move over southern Ontario overnight (illustrated below for late evening).

Will skies be clear over southern Ontario Sunday night?
Partly clear skies are expected during the evening and after midnight until regions of mid-level moisture (illustrated below for late evening) and uplift move over southern Ontario during early morning and cause skies to become mostly cloudy over most regions.

Will skies be clear over southern Ontario Saturday night?
Cloudy skies are expected except for partly clear skies over eastern regions of southern Ontario during early evening, in locations where thunderstorms don't develop, and where cloud cover remains thin enough to allow the brighter stars and planets to be visible and cause the appearance of partly clear skies. By mid-evening, increasing mid-level moisture is forecast to move eastward over all of southern Ontario (illustrated below for shortly before sunset) and cause skies to become cloudy.

Will skies be clear over southern Ontario Friday night?

Skies may be partly or mostly clear during the evening. Lots of moisture and clouds will be over southern Ontario but many regions are likely to be under partly or mostly clear skies during at least some of the evening. Areas close to Lakes Ontario and Erie are more likely to be under partly or mostly clear skies during the evening.

Will skies be clear over southern Ontario Thursday night?

Partly clear skies are likely during the evening over most regions and especially around western Lake Ontario, due to some mid-level moisture that is forecast to be over some regions (illustrated below for late evening) followed by mostly clear skies overnight.

Will skies be clear Wednesday night over southern Ontario?
Mostly cloudy skies are expected due to lots of mid-level moisture which is forecast to move eastward over southern Ontario overnight with a weak low pressure trough. Some patches of less cloudy sky may allow the moon to be visible and may cause skies to appear partly clear, but mostly cloudy conditions are likely over most regions especially during the evening. The cloudiness is likely to move eastward from southwestern regions by about midnight while some cloudiness may appear over most other regions during most of the night.

Will skies be clear over southern Ontario Sunday night?
Mostly cloudy skies are likely, due to some mid-level moisture moving eastward across southern Ontario (illustrated below for late evening) as well as due to lots of jetstream-level moisture along the jetstream over southern Ontario. Enough breaks in the clouds will most likely allow stars to be visible occasionally, giving the appearance of partly clear skies from time to time.

Will skies be clear over southern Ontario Saturday night?
Partly clearing skies are expected after midnight over most regions as most of the moisture moves eastward following tonight's cold front passage. Lots of moisture is forecast to continue moving eastward over southern Ontario overnight, but occasional breaks in the clouds will most likely allow stars to appear and give the appearance of partly clear skies. Also, the jetstream is forecast to move eastward over southern Ontario overnight and during Sunday (and Sunday night) and jetstream-level moisture may cause high clouds to appear and contribute some cloudiness.

Will skies be clear over southern Ontario Friday night?

Cloudy skies are expected, except for mostly cloudy skies during early evening in regions near or east of Toronto, as mid-level moisture (illustrated below for late evening) moves eastward over southern Ontario during the afternoon and evening. Jetstream-level cloud (illustrated below for late evening) will also be over any regions that are not completely overcast with mid-level cloudiness during early evening.

Will skies be clear over southern Ontario Thursday night?
Mostly cloudy skies are expected, with some periods of partly clear skies over some locations. The illustrations below show mid-level moisture forecast charts for late evening and for early morning, and some locations with less moisture can be seen, but jetstream-level moisture (not illustrated) and scattered high clouds will also be over southern Ontario overnight and could cause skies to appear mostly cloudy in locations where mid-level cloudiness decreases.

Will skies be clear over southern Ontario Wednesday night?
Mostly clear skies are likely, except for some scattered high-level clouds that may be visible during the evening over most regions, caused by jetstream-level moisture which is forecast to move eastward across southern Ontario mainly before midnight (illustrated below for late evening). Also some mid-level moisture may cause some mid-level clouds to appear occasionally over regions mainly west of Toronto and especially over far southwestern regions. Fog may also develop over many regions before sunrise.

Will skies be clear over southern Ontario Tuesday night?

Mostly cloudy skies are expected over most regions.

Will skies be clear Monday night over southern Ontario?

Skies are expected to be mostly clear except for some scattered high clouds that may appear occasionally over most regions (except for far southwestern regions that are more likely to remain clear) as jet stream-level moisture moves across southern Ontario overnight with the main jet stream (not illustrated with evidence to support this forecast, due to mobile connection hassles).

Note: no updates until Monday, August 8.
 Enjoy the clear skies!

Will skies be clear over southern Ontario Wednesday night?
Clear skies are expected. Some mid-level clouds may be visible after sunset, but mostly diminish and leave clear skies by late evening.

Will skies be clear over southern Ontario Tuesday night?

Mostly clear skies are expected, except for some mid-level cloudiness that may appear occasionally over some areas of southern Ontario (especially near, north and west of GTHA) caused by a region of mid-level moisture (illustrated below for late evening).

 

Will skies be clear over southern Ontario Monday night?
Mostly clear skies are expected by mid or late-evening, except for some mid-level clouds that may be visible occasionally, especially during early evening and especially south of Lake Huron, until mid-level moisture (illustrated below for late evening) moves southward from southern Ontario and the chance of seeing some occasional clouds diminishes overnight.