A system will slide into Southern Ontario late Tuesday and continue into Wednesday. Up to 15cm is possible through Central and Eastern Ontario. More details in a special forecast to be posted on Tuesday afternoon.
A system from Manitoba is expected to slide into Northwestern Ontario and could bring accumulating snowfall. There is low confidence in the exact amount for snow possible.
No heavy snowfall (2+cm) is expected in the forecast region on this day.
No heavy snowfall (2+cm) is expected in the forecast region on this day.
Snow squalls are expected to continue into Tuesday around Lake Huron and Georgian Bay. More details in a special outlook to be issued on Monday.
No heavy snowfall (2+cm) is expected in the forecast region on this day.
Lake effect snow and squalls may develop east of Lake Superior on Sunday. However, confidence is low in the exact amount of snow and locations affected. More details on Saturday.
No heavy snowfall (10+cm) is expected in the forecast region on this day.
Heavy snowfall is possible east of Lake Huron and around Georgian Bay on Wednesday due to a combination of a system to our north and lake effect snow. It is unclear exactly how much snow is possible along with who will be affected. More details on Tuesday.
No heavy snowfall (10+cm) is expected in the forecast region on this day.
It has been a fairly quiet year when it comes to winter weather across Southern Ontario so far. But as we ring in the New Year, it appears that our lack of wintery weather will come to an end as a potential snowstorm takes aim at Southern Ontario. The precipitation will begin late Saturday and continue into Sunday morning/afternoon with the worst conditions expected during the overnight on Saturday. This system will also be accompanied by wind gusts ranging from 30-50km/h which may bring the potential for some blowing snow and reduced visibility out on the roads.
We will start the first morning of the New Year on Saturday with some scattered showers and temperatures a few degrees above the freezing mark. A second round of precipitation is expected to reach our region by the afternoon on Saturday starting with the Windsor area and spreading towards the northeast later in the day. It will likely start as some rain for those closer to Lake Erie and Lake Ontario shoreline, but colder air will flow in from the northwest as this storm moves through the region which will allow for a change over to some wet snow by the early evening.
Further north, the cooldown will have already occurred before the precipitation starts so it should come down as mainly just snow. Eastern Ontario will also see some rain or mixing as the system reaches them by the evening which will switch over to snow by midnight. Moderate to heavy snowfall will continue overnight and into Sunday morning. We should start to see some clearing just after sunrise on Sunday starting with those in the west and by the afternoon for Eastern Ontario.
The exact impacts of this system will vary depending on the track so we should note that the above map is only a very preliminary estimate of potential snowfall accumulation. We are still just under 48 hours away from the beginning of the snow and there is the chance that models shift around closer to the event which would mean the swath of the heaviest snowfall will also shift. There is lower confidence along the Lake Ontario shorelines, Deep Southwestern Ontario and into Eastern Ontario along the International border which could see more mixing or rain. If the switch over to snow doesn’t happen as fast as currently indicated by the models, it may result in underachieving snowfall totals in those areas.
At this point, we believe there is the potential for between 12-20cm of snowfall accumulation extending from the Lake Huron shoreline, through Lake Simcoe and into the Ottawa Valley. More widespread totals will range from 8-16cm which includes the rest of Southwestern Ontario through the Golden Horseshoe and Central/Eastern Ontario. Lower totals are expected for the Lake Erie shoreline where the switch over to snow will take longer and will see more rain from this system. Again, these zones may shift around somewhat depending on the track so be sure to check back late Friday for our final detailed forecast on this system.
No heavy snowfall (2+cm) is expected in the forecast region on this day.
Heavy snow is possible on Monday throughout Northern Ontario, but there is low confidence on the exact extent of the snow and if it will reach the 10cm criteria.
A system may affect parts of Northwestern Ontario late Friday with heavy snowfall or freezing rain. The precipitation will continue into Saturday making for a messy Christmas Day. A special forecast for this will be coming on Thursday.
A system could bring the potential for accumulating snow around Lake Huron and into the GTA late Thursday and into Friday. However, confidence in the track and intensity is low at this point.
No heavy snowfall (10+cm) is expected in the forecast region on this day.
No heavy snowfall (2+cm) is expected in the forecast region on this day.
A system could bring accumulating snow between 5-15cm on Saturday to parts of Southern Ontario. The heaviest snow appears to be around Lake Ontario and into Eastern Ontario although that may change. There is very low agreement between the models at the moment. More details in a forecast to be released on Friday.
A potential winter storm could bring the threat of freezing rain and heavy snowfall to parts of Northeastern Ontario throughout the day on Saturday. This will also be accompanied by strong wind gusts which may result in blowing snow and raise the power outage risk in areas that see the freezing rain. More details to come in a special forecast to be posted on Friday.
Heavy snowfall continuing from a system that throughout snow to other parts of Northern Ontario could bring up to 10-15cm to parts of Northeastern Ontario during the morning. More details in an outlook to be released Thursday evening.
