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| A strong cold front will bring an end to the current heatwave in Montreal. The storms should fire up this afternoon, impacting Montreal between 4pm and 8pm. (AccuWeather) |
A strong cold front will sweep across eastern Ontario and southern Quebec late today and into the wee hours of Thursday morning. Montreal has been entrenched in a soupy air mass this week, with high temperatures near 30C (86F) and oppressive humidity readings. Dew point temperatures, which are a strong indication of the amount of water vapour in the atmosphere, have been more Florida-like, in the middle 20s (70s F). Humidex readings exceeded 40C (104F) for over 4 hours in Montreal on Tuesday afternoon. Conditions would have been even warmer if it were not for several rounds of showers and thunderstorms.
Wednesday's cold front should arrive late this afternoon, with areas of strong thunderstorms developing in advance of the system. The most likely time for severe weather in Montreal, would be between 4pm and 8pm. The high temperature today will be near 30C. Any strong storms that do develop will have the potential to produce damaging winds and heavy rain. There is even a very slight risk of an isolated tornado north of metro Montreal. Keep in mind that with any scenario such as this, the storms are scattered in nature. While weather watches may be issued for a large area, the actual storms may only affect a small sector of the region. This is common with thunderstorm activity as we witnessed on Tuesday afternoon. They can pop up quickly, produce damaging winds and flooding rain and dissipate just as fast. Stay alert.
Cooler and much drier air will arrive on Thursday, with a daytime high of 23C (73F) and much lower humidity. Thursday night will be clear and refreshingly cool, with lows around 11C (52F).
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