Environment Canada has issued warnings for Montréal and the Montérégie region ahead of heavy rainfall expected to total 40 to 60 millimetres this Tuesday. Forecasters predict that water accumulation on roads and in low-lying areas is likely, alongside suddenly reduced visibility at times during the storm.
Rainfall Totals and Timeline for Montréal and Montérégie
The heavy rain is projected to start on Tuesday afternoon and continue until around midnight. Following the midnight cessation, conditions across Montréal and the Montérégie region are expected to turn cloudy for the remainder of the night. Daytime temperatures will hover near 10 degrees Celsius, accompanied by steady winds of 20 km/h and gusts reaching 40 km/h. Additional showers are expected to follow during the day on Wednesday.
According to federal weather forecasters, a quasi-stationary warm front interacting with a low-pressure system sliding south of the border is driving the heavy rain bands across the region.
Did You Know? October typically averages five days of thunderstorms in the province of Quebec, but the region has already recorded seven stormy days as of October 12, according to MétéoMédia data.
Regional Weather Contrasts and Storm Risks Across Quebec and Ontario
While the southern part of Quebec braces for steady downpours and temperatures near the seasonal norm of 10 degrees Celsius, neighboring Ontario is becoming significantly warmer. MétéoMédia reports that afternoon temperatures in Windsor, Ontario, could climb to 28 degrees Celsius with a humidex near 35, while Toronto anticipates a high with a felt value of 31.
Meteorologist Alexis Vazquez notes that Quebec remains trapped between distinct air masses, resulting in much more volatile conditions than those seen in southern Ontario. Although the primary threat for Quebec involves heavy rainfall, MétéoMédia cautions that storm cells generating high winds and small hail in Ontario overnight could potentially clip parts of the province on Tuesday.
Coastal Warnings and Atlantic Canada Conditions
Beyond the Montréal and Montérégie zones, severe weather alerts extend to other Canadian provinces. Le Devoir notes that a yellow storm warning is in effect for the Quebec region, where high water levels, strong winds, moderate storm surges, and high-amplitude tides threaten to create minor coastal flooding along local shorelines during the evening hours.
Further east, interior regions of southern New Brunswick are under a yellow alert. While Quebec deals with heavy rain, New Brunswick faces sub-zero temperatures and overnight frost that could cause agricultural and plant damage.
Frequently Asked Questions
What is the total expected rainfall for Montréal and Montérégie?
Environment Canada forecasts total accumulations of 40 to 60 millimetres of rain for Montréal and the Montérégie region on Tuesday.
When will the heavy rain start and stop?
Precipitation is expected to begin on Tuesday afternoon, occasionally fall heavily, and taper off around midnight before clearing into cloudy skies.
What weather conditions are expected alongside the rain?
Forecasters anticipate daytime temperatures near 10 degrees Celsius, winds blowing at 20 km/h with gusts up to 40 km/h, and a risk of water accumulation on roads and in low-lying areas.
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