Following a period of mostly dry weather, southern Quebec is bracing for thunderstorms and torrential rain on Wednesday. Significant rainfall is expected in various regions, with localized risks of heavy accumulations.
Thunderstorms and Heavy Rain Predictions for Wednesday
Thunderstorms are set to develop on Wednesday, predominantly near the Ontario border. The main concern is not strong winds or hail, but the potential for substantial rainfall. Forecasts indicate that some areas may receive between 75 to 100 millimeters of rain in less than 24 hours.
Weather Conditions Favorable for Heavy Showers
An exceptionally humid air mass is settling over southern Quebec, providing ideal conditions for heavy downpours. Even minor storm cells could produce torrential rain. The storms are expected to primarily affect areas close to Ontario in the afternoon and gradually move eastward towards the greater Montreal area by evening and overnight.
Monitoring Potential Accumulations
The atmosphere is currently saturated with moisture, making it conducive for heavy rainfall. Some regions may experience rainfall equivalent to several days’ worth of precipitation in just a few hours.
- Expected rainfall accumulations: 75 to 100 mm locally.
- Regions of concern: Outaouais and Laurentians.
Ongoing Instability Through the Week
Even after the heaviest rain subsides on Wednesday, instability will linger. Residual showers and isolated storm cells may still develop into Thursday morning. The humid air mass is expected to remain until a cold front arrives Friday, potentially triggering another round of storms before cooler air arrives for the weekend, providing some relief from the humidity.
This transitional weather presents a notable shift for residents who have been experiencing unusually humid conditions in recent days.
