A large area of low pressure stationed over northern Ontario generated stormy conditions across a broad swath of eastern Canada over last weekend. Now, another system moving in from the U.S. will keep things unsettled for the remainder of this week.
Eastern Canada got a brief break from the stormy weather on Monday, but a system pushing in from the south will help conditions deteriorate once again.
“We are expecting it to be a significant low, with strong winds and heavy rain with this low,” says Brian Owsiak, a meteorologist at The Weather Network. “Winds could gust anywhere between 70 to even 90 kilometres an hour in exposed areas in southern Ontario near the Great Lake shoreline. And even in the Maritimes, with this low moving in, you could expect quite strong winds, particularly near coastal sections, again gusting upwards of 80 to 90 kilometres an hour.”
Unless you're in coastal areas, winds with this system won't be a dominant factor on the East Coast.
Winds, however, will largely dominate parts of Ontario ahead of the rain. There was a wind warning in Hamilton and St. Catherines as early as Wednesday morning.
As of Wednesday morning, parts of the Maritimes were under a rainfall warning that was issued by Environment Canada. Some areas could get as rain between 50 to 90 millimetres.
As the storm progresses over the next few days, steady rain will likely be a main feature in Ontario.
“At this point, we are expecting the heaviest rain to fall near Lake Huron and more so into southwestern Ontario, particularly in the Windsor and London areas. We could see anywhere between 25 and 50 plus millimeters of rain in those areas,” says Owsiak.
But by Thursday morning, winds and rain should be subsiding in Ontario, whereas the system will out of the Maritimes by Friday morning.
Intense wind and rain events lasting several days are common at this time of year, says Diar Hassan, another meteorologist at The Weather Network.
“It's because the contrast in temperature between the two air masses, north and south, is quite prominent,” he explained. “When those two air masses collide with each other, we can see intensification of the systems. “This is typical fall weather,” he added.
Another common phenomenon at this time of year, especially in Ontario, is lake-effect showers. As cold winds pass over the warm waters of the Great Lakes, they can produce heavy showers along the shorelines.
Westerly winds in the wake of the current low pressure system will increase the chances of lake effect rain, especially along the Huron Shores, Georgian Bay and Lake Superior.
Driving can be difficult in this kind of weather. The right tires on your vehicle can help you avoid hydroplaning.
It's also a good idea to take the necessary steps to avoid basement flooding.
For a closer look at the weather forecast, be sure to check our Canadian Cities Index.
With files from Andrea Stockton, Lyndsay Morrison and Sana Ahmed