The lake-effect snow machine is working at full capacity in southern Ontario this week, with another round impacting the region on Wednesday. This follows the potent bands and intense winds that disrupted travel, and brought hefty accumulations to some communities Monday and Tuesday. A weak disturbance will bring another dusting to southern areas, though locales in the traditional snowbelt regions near Lake Huron and Georgian Bay will see slightly higher amounts because of lake enhancement. Travellers should expect to encounter some difficult travel in these regions. Yet more snow is on the way for Thursday evening, thanks to a clipper racing through, followed by a huge boost in temperatures, which will see soaring daytime highs. For more on the snowfall expected for Wednesday and Thursday, and a look at Saturday's potential record-setting warm temperatures, read below.
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WEDNESDAY: STUBBORN LAKE-EFFECT SNOW PERSISTS, BRINGS ANOTHER COATING
A weak disturbance and lake enhancement will help bring more snow to southern Ontario Wednesday. The minor system will bring widespread scattered flurries through the afternoon, but the snowbelt regions will see some lake enhancement, thus increasing accumulations.
This will be particularly the case for areas along the shores of lakes Superior and Huron, as well as northern Georgian Bay. Squalls will be on-and-off through the day. As well, a southerly flow will spark a band along the eastern Lake Ontario shore, targeting Kingston, especially.
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Travel will likely be impacted once more in these regions, so motorists should be mindful before heading out on the roads.
Through Thursday, snowfall totals from the previous rounds this week and what falls Wednesday could reach 15-30 cm along the shores of Georgian Bay, and lakes Huron and Superior. Less than 5 cm in most other locales in the south, with pockets of up to 15 cm near the east end of Lake Ontario and southern Lake Huron.
As well, winds will be the blustery Wednesday afternoon, especially along the lake shores, as we have a tight pressure gradient that will prompt gusts of 40-60 km/h.
LOOK AHEAD: TEMPERATURES WARM UP SIGNIFICANTLY, MORE SNOW, RAIN CHANCES
Conditions will be fair and a few degrees milder Thursday. A clipper tracking north of the region will bring some light snow in the evening and overnight hours, with rain-snow mix near Lake Ontario and light rain for southwestern sections.
Friday will be on the mild side, thanks to a warm front, but conditions will remain cloudy.
Beyond, a Colorado low is expected to track north of the region Friday through Saturday. This should bring another soaking rain and blustery winds to southern Ontario, with very mild and near record-breaking temperatures. Temperatures will soar into the low- to mid-teens across the region.
Cooler, but still above seasonal, conditions will filter in behind this system. Very mild temperatures will appear for most of next week, with values more reflective of early November.
Forecasters are watching the potential for a pattern change between Dec. 20-25 -- which will be the key to whether we see a white Christmas.
Check back with The Weather Network often as we monitor the progress of the active storm track across Ontario.