When the Warm Front Stalls, the Rain Begins

There is a particular kind of weather that arrives not as a sudden storm but as a slow, steady soaking—the kind that fills low-lying areas, pools on roadways, and reduces visibility in moments that catch drivers unprepared. For Montreal and the surrounding regions, that kind of weather is forecast for Tuesday, as Environment Canada has issued a rainfall warning for the city and the Montérégie region, with totals expected to reach between 40 and 60 millimeters.

The warning, issued Monday, covers Montreal, Laval, and the Montérégie, with the rain expected to begin Tuesday morning and continue into the evening . The cause is a nearly stationary warm front associated with a low-pressure system moving south of the border, which forecasters say will facilitate the passage of bands of heavy rain . The Eastern Townships and the Bois-Francs area are also under a special weather statement, with significant rainfall possible there as well .

Environment Canada warns that water accumulation is likely on roads and in low-lying areas, and that visibility may be suddenly reduced at times . These are the conditions that can turn an ordinary commute into something more hazardous—standing water that hides potholes, spray from trucks that briefly erases the view ahead, and the kind of slick pavement that demands caution.

The forecast totals would be significant for the region. If Montreal receives the upper end of the predicted range, it would break a rainfall record set in 2005, when 27.2 millimeters fell on the same date . The rain is expected to continue into the early morning hours of Wednesday, with periods of drizzle in the forecast, followed by cloudy skies after sunrise. Thursday should bring a return of sunshine, though more rain is expected by Friday .

For residents, the advice is straightforward: allow extra time for travel, avoid low-lying areas where water may pool, and be prepared for reduced visibility. Rainfall warnings are issued when significant impacts are expected, and Tuesday’s forecast meets that threshold . The rain will pass, as it always does, but the day will require patience—and perhaps an umbrella that stays close at hand.

AI Image Disclaimer: The imagery in this article was generated using artificial intelligence for illustrative purposes only and does not depict the actual weather conditions described.

Sources: CBC News, CityNews Montreal, CTV News, Global News, Environment Canada