Wednesday 31 December 2014

Will skies be clear over southern Ontario Wednesday night?

It looks like lots of low-level moisture over southern Ontario will be causing partly cloudy skies, except for occasionally clear and occasionally overcast skies, over most regions.


Sunday 28 December 2014

Will skies be clear over southern Ontario Sunday night?

It looks like skies are likely to be mostly clear by or shortly after sunset, except for some jetstream-level cloud that could appear as cirrus during the evening, and lots of low-level moisture which is likely to move southeastward from southern Ontario by sunset but some of the moisture could cause some low-level clouds during the evening especially near Lake Ontario.


Sunday 21 December 2014

Will skies be clear over southern Ontario Sunday night?

It looks like there will be a lot of low clouds caused by lots of low-level moisture below a subsidence inversion. Some regions may become partly clear, but more widespread low cloudiness is likely to remain near and north of the Toronto area.
Later in the evening or by early morning, the low cloudiness may diminish and leave partly clear skies over more regions than during the evening.


Saturday 20 December 2014

Will skies be clear Saturday night over southern Ontario?

Mostly (or completely) cloudy skies are likely, due to a region of mid-level moisture moving across southern Ontario overnight, although breaks in the cloud may allow stars to be visible and to give the appearance of a partly clear sky from time to time.


Friday 19 December 2014

Will skies be clear Friday night over southern Ontario?


It looks like skies will probably become clear over most regions of southern Ontario, except for near the GTA and regions between western Lake Ontario and Georgian Bay, where a region of mid-level moisture is expected to spread northward during the night. By early Saturday morning, the mid-level cloudiness may have moved out of skies over the GTA and be over regions near Lake Huron. Other regions may be mostly clear, but widespread low-level overcast cloudiness may persist over some regions due to moisture remaining below a widespread subsidence inversion.



Sunday 7 December 2014

Will skies be clear Sunday evening over southern Ontario?
Increasing high-level cloudiness over southern Ontario during the afternoon and evening  ought to cause mostly cloudy skies during the evening, except that skies may appear to be clear in some areas with breaks in the high cloud and with the very bright near-full moon shining and giving an impression of a clear sky.

Saturday 6 December 2014

Will skies be clear Saturday night over southern Ontario?
Clear skies are expected, ahead of a strong high pressure ridge, except for some low-level clouds that may appear over some areas during the evening.

Thursday 4 December 2014

Will skies be clear over southern Ontario Thursday night?


It looks like mostly cloudy skies are expected ahead of an upper-level disturbance moving northeastward over SW Ontario overnight, except for some locations where skies may be partly clear during the early evening long enough for the bright, nearly full moon to be visible and give the impression of a partly clear night.


Wednesday 3 December 2014

Will skies be clear over southern Ontario Wednesday night?

Skies are likely to be mostly clear by sunset, due to a strong high pressure ridge building eastward over the Great Lakes region, except for lots of low-level cloudiness south and east of Lake Huron and Georgian Bay especially during the evening.


Monday 1 December 2014

Will skies be clear over southern Ontario Monday night?


It looks like cloudiness ought to diminish during the evening and then skies ought to become mostly clear overnight.  The main exception is southwestern Ontario, where some mid to high-level cloudiness is forecast to gradually spread northeastward over southwestern Ontario during the night.



Thursday 27 November 2014

Will skies be clear over southern Ontario Thursday night?
Mostly cloudy!
Lots of mid and low-level moisture.


Tuesday 25 November 2014

It looks like partly clearing skies are likely over some or most regions of southern Ontario overnight as mid-level moisture moves northeastward from southern Ontario (as in the chart below) but many regions will experience some lake-effect cloudiness due to low-level moisture flowing eastward from Lake Huron and Georgian Bay.

Friday 21 November 2014

Will skies be clear Friday night over southern Ontario?


It looks like skies will remain mostly clear during the evening, without interference from pesky lake-effect cloudiness, but increasing mid to high-level moisture ahead of an approaching warm front is likely to appear over southern Ontario before early morning.


Monday 17 November 2014


Clearing skies are expected by sunset as deep moisture moves eastward from southern Ontario following Monday's cold front, except for some low-level cloudiness especially over regions east of Lake Huron and Georgian Bay, and so partly clear skies are likely over most regions overnight.


Friday 14 November 2014

Will skies be clear over southern Ontario Friday night?
It looks like mostly clear skies are likely, except for low-level clouds that will probably move across most regions from time to time during the night and will be more common over regions south and east of Lake Huron and Georgian Bay.

Monday 10 November 2014

Will skies be clear Monday night over southern Ontario:

It looks like skies may become mostly clear within several hours after sunset, but lots of jetstream-level moisture will most likely be visible as cirrus cloud in the bright moonlight.


Saturday 1 November 2014

Will skies be clear over southern Ontario Saturday night?
Skies will most likely be mostly clear by sunset, except for some low-level moisture that may cause low-level clouds to be visible over some regions during the evening, particularly south of Georgian Bay and Lake Huron. Then, clear skies are expected overnight.

Wednesday 29 October 2014

Will skies be clear over southern Ontario Wednesday evening?


It looks like skies will remain mostly cloudy, due to low-level cloudiness. Although mid-level cloud will be diminishing, lots of low-level moisture will most likely result in lots of low-level cloudiness with occasional clear breaks over some regions.

Tuesday 28 October 2014

Will skies be clear over southern Ontario Tuesday night?
It looks like skies will become mostly clear, following passage of a cold front across southern Ontario Tuesday afternoon, except for patches of low-level moisture that will appear as scattered low clouds. The low clouds will cover more of the skies in northern regions of southern Ontario (near and east of Lake Huron), and less in southern regions near Lakes Erie and Ontario.

Monday 27 October 2014

Will skies be clear over southern Ontario Monday night?


It looks like skies will be partly cloudy after sunset and then cloudy later in the evening as increasing mid-high level moisture flows over southern Ontario (as shown on the chart below for moisture at the 700 hPa level) but increasing jetstream-level cirrus moving over southern Ontario during Monday afternoon will contribute to the cloudiness. 


Saturday 25 October 2014

Will skies be clear over southern Ontario Saturday night?

It looks like skies will be mostly clear by late afternoon, after a weak upper-level front moves eastward during the afternoon, except for some low-level clouds that may develop during the evening over most regions. Later, after midnight, some mid-level cloudiness may develop over regions approximately east of the Kitchener area (according to the latest forecast chart, shown below).



Thursday 23 October 2014

Will skies be clear Thursday night over southern Ontario?


It looks like skies are likely to be clear during the evening (as well as before sunset during the solar eclipse) and then increasing high-level cloudiness is likely to appear after midnight in southwestern regions and by dawn over eastern regions of southern Ontario, caused by jetstream-level moisture moving eastward over the central Great Lakes region ahead of a low pressure trough west of the Great L:akes during Thursday.

Wednesday 22 October 2014

Will skies be clear over southern Ontario Wednesday night?


Mostly clear skies are likely, except for some low-level cloud in some regions near the western Lake Ontario area, caused by moisture circulating westward over the Lake Ontario region from a low pressure trough near the Atlantic coast.

Saturday 18 October 2014

Will skies be clear Saturday night over southern Ontario?

It looks like mostly cloudy skies are likely, due to extensive low-level moisture resulting in low-level cloudiness, except for gradually clearing skies over southwestern regions after midnight. Over and south of Georgian Bay, the atmosphere will have sufficient moisture to remain cloudy all night, and regions of southern Ontario south and east of Georgian Bay will most likely remain mostly cloudy all night.

Friday 17 October 2014

Will skies be clear over southern Ontario Friday night?

It looks like mostly cloudy skies are likely, caused by lots of moisture and uplift associated with an upper level trough over Ontario, except that some partly clearing skies may develop following the passage of an upper cold front overnight. The result is that most locations will be under cloudy skies except for some clearing skies for several hours over some locations.

Sunday 12 October 2014

Will skies be clear Sunday evening over southern Ontario?
It looks like skies will be mostly clear during the evening, except for jetstream-level moisture which is forecast to move northeastward across southern Ontario ahead of a warm front after sunset and may be visible as high clouds. Later in the evening, mid-level moisture and cloudiness is forecast to move over southern Ontario and may not cause noticeable widespread cloudiness until after midnight over eastern regions of southern Ontario (such as east of the Toronto area).



Saturday 11 October 2014

Will skies be clear over southern Ontario Saturday night?

It looks like clear skies are likely by sunset, due to a high pressure ridge over southern Ontario, with daytime low-level cumulus clouds (that are causing some afternoon cloudiness over some regions) likely to dissipate by sunset.

Friday 10 October 2014

Will skies be clear over southern Ontario Friday night?

Mostly clear skies are likely, caused by subsidence under a high pressure ridge spreading eastward over the Great Lakes region, but several sources of moisture may cause some cloudiness to be visible in the bright moonlight.

Low-level moisture near western Lake Ontario during the early evening (shown on the forecast chart below) may cause some low-level clouds over some locations. Another potential source of clouds is a frontal zone south of Ontario, and high-level cirrus clouds that are visible over southern Ontario during Friday afternoon may cause visible high cloudiness overnight, especially over southwestern regions.


Thursday 9 October 2014

Will skies be clear over southern Ontario Thursday night?


It looks like skies will be gradually clearing during the evening as extensive afternoon cloudiness dissipates, but conditions are suitable for cool upper-level air flowing across the relatively warm water surfaces of Lake Huron and Georgian Bay to create low-level cloudiness and transport it eastward across southern Ontario. So, some periods of cloudiness can be expected throughout the night in regions east of Lake Huron while mostly clear skies are likely in southwestern regions south of Lake Huron.


Wednesday 8 October 2014

Will skies be clear over southern Ontario Wednesday night?


Skies are likely to become mostly clear by sunset over most regions, as a high pressure ridge builds eastward over the western and southern Great Lakes regions, while an upper level low over northern Ontario maintains some moisture and cloudiness north of southern  Ontario. Light (not calm) winds ought to prevent fog formation over regions with moist ground, and there should be no problem seeing the Hunter’s Moon.

Tuesday 7 October 2014

Will skies be clear over southern Ontario Tuesday night? More specifically, during the total lunar eclipse near morning twilight?


It looks like skies may be clearing over southern Ontario after midnight, following passage of a cold front. Southern Ontario may be ideally located in the zone of subsidence for several hours that follows the cold front and will most likely be causing clouds to dissipate and leave at least partly clear skies by the time of the eclipse. The clearing appears to be more favourable west of Toronto and less favourable east of Toronto, but all regions may see occasional clear periods at some time before Wednesday morning.

Monday 6 October 2014

Will skies be clear over southern Ontario Monday night?

It looks like skies will be mostly cloudy during the evening, due to a region of mid-level moisture and uplift moving over southern Ontario, and then mostly clear between midnight and dawn after the region of moisture moves northeastward from southern Ontario.


Saturday 4 October 2014

Will skies be clear over southern Ontario Saturday might?

Partly cloudy skies are likely, with lots of moisture in the atmosphere, but regions of subsidence will be causing periods of clearing skies over many regions overnight. So, most regions should expect partly or mostly clear skies with some cloudy periods.

Wednesday 1 October 2014

Will skies be clear over southern Ontario Wednesday evening?
Skies are likely to be overcast with low cloud over most regions, except for possible clearing over some southwestern regions, due to extensive low-level moisture remaining trapped below a low-level subsidence inversion.



Monday 29 September 2014

Will skies be clear Monday night over southern Ontario?
It looks like skies will remain mostly clear for several hours after sunset over most regions near and east of Lakes Erie and Ontario, but cloudiness is expected to move southeastward across southern Ontario later in the evening.


Sunday 28 September 2014

Will skies be clear Sunday night over southern Ontario?
It looks like skies will be mostly cloudy, due to widespread high clouds and some regions with thicker middle-high clouds.

Saturday 27 September 2014

Will skies be clear over southern Ontario Saturday night?
It looks like skies will be mostly clear except for high cloud at jetstream level which is forecast to move northeastward over southern Ontario during the evening. So, the moisture may be visible as cirrus or cirrostratus cloud earlier in southwestern Ontario and later in the evening toward the Toronto region.


Friday 26 September 2014

Will skies be clear Friday night?
Clear skies continue, no need for any details or supporting information!

Thursday 25 September 2014

Will skies be clear Thursday night over southern Ontario?
Continuing clear skies are continuing as a result of a high pressure region over southern Ontario.
The only detail that may be worthwhile to point out is the presence of some jetstream-level moisture forecast to be over southern Ontario Thursday evening, that may appear as some cirrus clouds in the sky over regions mainly west of Toronto.



Tuesday 23 September 2014

Will skies be clear over southern Ontario Tuesday night?

Skies are likely to be mostly clear as a result of a large high pressure ridge over the province.


Monday 22 September 2014

Will skies be clear over southern Ontario Monday night?
Skies are likely to become mostly clear before sunset and be mostly clear overnight. Some mid-level moisture may occasionally appear as visible clouds, and jetstream-level cirrus clouds might also appear over some locations.

Friday 19 September 2014

Will skies be clear Friday night over southern Ontario?

It looks like skies will be mostly clear during the evening, except for increasing high cloudiness, followed by increasing mid-level cloudiness later Friday evening moving southeastward over southern Ontario.




Thursday 18 September 2014

Clear skies are expected Thursday night over southern Ontario as a result of a high pressure region over the province. Northeasterly winds flowing around the high are transporting dry and clear air over southern Ontario. Some low-level cloud is likely to develop and move over GTA regions near western Lake Ontario before sunrise.


Wednesday 17 September 2014

Will skies be clear over southern Ontario Wednesday night?


Skies are likely to be mostly clear during the evening, until a weak cold front moves southward over southern Ontario overnight and provides uplifting motion that will act on some mid-level moisture to form clouds, and probably cause a mostly cloudy sky before early morning.

Tuesday 16 September 2014

Will skies be clear over southern Ontario Tuesday night?

It looks like mostly clear skies are likely, except for some scattered low clouds. The forecast chart below indicates the presence of some low-level moisture after sunset that could appear as scattered clouds occasionally.



Sunday 14 September 2014

Will skies be clear Sunday evening over southern Ontario?

It looks like mostly clear skies are likely, beginning near sunset. Lots of low-level moisture, and vertical lift caused by an upper-level trough over Ontario, are causing low clouds during Sunday afternoon but the clouds are likely to stop forming during late afternoon and dissipate around sunset over most regions. Some periods of clouds will continue to develop overnight, due to the abundance of the low-level moisture, but most regions of southern Ontario are likely to see clearing skies before, near, or after sunset.


Saturday 13 September 2014

Will skies be clear Saturday night over southern Ontario?

Lots of low-level moisture will be causing low clouds. Periodic clear spots may give the impression of mostly clear skies occasionally, but most regions ought to expect partly cloudy skies. More cloudiness is likely southeast of Lake Huron and Georgian Bay.