Monday 29 June 2015

Will skies be clear Monday night over southern Ontario?

Mostly cloudy skies are expected due to increasing moisture and cloud at mid and upper levels (illustrated below) but skies may be partly clear during the evening in some regions (and probably clear enough to look at the Venus-Jupiter conjunction sometime during the evening).


Sunday 28 June 2015

Will skies be clear over southern Ontario Sunday night?
Partly clearing skies are expected over southwestern regions overnight as a low pressure storm moves eastward from the eastern Great Lakes region and a weak high pressure ridge builds over Lake Erie.
Mid-level moisture is forecast to diminish during the evening (illustrated below) and skies are likely to become partly clear over southwestern regions.

Friday 26 June 2015

Will skies be clear over southern Ontario Friday night?

Skies will be mostly cloudy due to increasing high cloudiness overnight, but skies could appear to be mostly clear during the evening over some regions where breaks in the high cloud allow the moon and bright planets to be easily visible.


Wednesday 24 June 2015



Will skies be clear over southern Ontario Wednesday night?

It looks like skies will be mostly clear during the evening and then increasing high-level moisture (illustrated below) will cause increasing high cloudiness to appear between midnight and dawn.


Tuesday 23 June 2015

Will skies be clear over southern Ontario Tuesday night?

It looks like skies will be clear by sunset as a high pressure ridge builds over the Great Lakes region overnight.

Monday 22 June 2015

Will skies be clear over southern Ontario Monday evening?

Cloudy skies are expected by sunset due to increasing cloudiness ahead of a cold front which is forecast to move eastward over the Great Lakes overnight.

Sunday 21 June 2015

Will skies be clear over southern Ontario Sunday night?

It looks like skies will be mostly clear as a weak high pressure ridge (illustrated below for EDT 23:00) moves eastward across southern Ontario overnight, except for some patches of low-level cloud that may move across some locations.

Saturday 20 June 2015

Will skies be clear over southern Ontario Saturday night?

Mostly cloudy skies are likely as several regions of moisture move over southern Ontario and cause increasing cloudiness during the evening, but some breaks of partly clear skies (with lots of high-level cloudiness) could develop over some locations overnight.


Friday 19 June 2015

Will skies be clear over southern Ontario Friday night?


Mostly clear skies seem likely as a high pressure ridge moves over southern Ontario, except for some jetstream-level moisture which is forecast to be over southwestern Ontario (illustrated below) and might be visible as cirrus clouds.


Thursday 18 June 2015

Thursday night - cloudy skies over southern Ontario following the cold front passage, then clearing between midnight and dawn.

Wednesday 17 June 2015

Lots of mid-and high-level cloudiness moving eastward over the Great Lakes region during Wednesday will be causing partly or mostly cloudy skies overnight, although some regions may occasionally have less cloud and may appear from urban areas to be partly or mostly clear, with the brighter stars and planets visible.

Tuesday 16 June 2015


Skies ought to be clear, except for increasing jetstream-level moisture overnight (illustrated below) that will be moving eastward across southern Ontario overnight, and that may or may not appear as cirrus clouds.



Thursday 11 June 2015

Will skies be clear over southern Ontario Thursday night?
Mostly cloudy skies are expected with increasing high cloudiness overnight, but some breaks in high-level moisture (illustrated below) might allow brighter stars to be visible and give the impression of partly clear skies from time to time during the evening.


Wednesday 10 June 2015

Will skies be clear over southern Ontario Wednesday night?

It looks like most of the mid-level moisture will be east of southern Ontario (illustrated below) by the end of twilight, and skies will be clearing following the passage of this afternoon’s cold front. Some high-level moisture may persist and might be visible as high cloudiness over some regions.



Tuesday 9 June 2015

Will skies be clear over southern Ontario Tuesday night?

Skies will most likely be clear by twilight, as a weak high pressure ridge moves eastward across southern Ontario overnight, and skies are clearing as expected during Tuesday afternoon with some afternoon convection cloudiness likely to diminish around sunset and jetstream-level cloudiness moving eastward following the cold front.

Some haze may appear in the sky (or may remain invisible) resulting from a thick plume of smoke aloft from forest fires in Saskatchewan that is moving eastward across the central Great Lakes region during Tuesday afternoon and is expected to move eastward overnight toward southern Ontario.

Saturday 6 June 2015

Will skies be clear over southern Ontario Saturday night?

Mostly clear skies are likely except for jetstream-level moisture (illustrated below for late evening) that may appear as high, thin cloudiness from time to time over most locations, and that may become thicker and more widespread by early Sunday morning.


Friday 5 June 2015

Will skies be clear over southern Ontario Friday night?

It looks like skies will become clear during late evening as moisture (illustrated below) along a low pressure trough moves southeastward from southern Ontario during the evening. So, skies may become clear near or after midnight.