Slow-moving front to soak Ontario and Quebec with rain, gusty winds
Warm air comes in on Monday, followed by showers, storms and soaking rain throughout the week
A slow-moving cold front is preparing for a wet stretch across southern Ontario and Quebec, with heavy rain, a few thunderstorms and breezy conditions through midweek.
Monday begins on a somewhat calm note, with much of the region located in the warm sector ahead of the system. Temperatures will rise to the low 20s in southern Ontario and the upper teens in southern Quebec, with a mix of sun and clouds in most areas.
Southern Quebec may see some early morning rain, but the wind will be the main story throughout the day. Southerly gusts will increase throughout the afternoon, particularly in southwestern Ontario and the GTA, reaching 40 to 60 km/h.
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Showers build as the front moves in
By Monday evening, the pattern starts to shift. Showers will move into extreme southwestern Ontario, with a chance of thunder at the end of the day.
The system will fully ramp up on Tuesday as the cold front moves through. Showers will become more widespread and consistent, with moderate rain developing in the GTA, eastern Ontario and southern Quebec throughout the afternoon and evening.
Warm, unstable air ahead of the front may also produce a few stronger thunderstorms, especially in Quebec's Eastern Townships. Heavy downpours, small hail and strong winds are all possible in these areas.
Elsewhere, including Niagara and parts of eastern Ontario, there is a slight chance of embedded thunderstorms, but for the most part, it will be a steady downpour. As the front moves east, winds will continue to gust.
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Rain lingers into midweek
This system will not rush to leave.
A blocking high over Atlantic Canada will slow the front's progress and allow more moisture to enter the system. This means more rain in southern Quebec on Wednesday, adding to the already wet conditions.
Rainfall totals in southern Quebec could reach 50 to 60 mm by the end of the season.
Behind the front, cooler, below-seasonal air will settle in, signalling a significant departure from the early-week warmth.
Stay with The Weather Network for the latest across Ontario and Quebec