After a polar vortex that turned city streets into ice rinks at the end of November, and before a mild and sunny Christmas, Montreal is about to get a weather bomb.
A storm is approaching, and with the weather getting milder very quickly, winds blowing harder and harder, it ‘s going to be a heavy, scary day on Thursday December 18, 2025.
Montrealers are bracing themselves for lots of rain, gusty winds and possible power cuts on Friday, December 19, 2025.
What’s a weather bomb?
What meteorologists call a “bomb” -because it’s a bit dramatic for a storm that only requires a yellow alert-is an intensification of a weather system to a breaking point. It looks like it’s going to explode.
For example, the weather system that’s going to blow up in our faces on Friday and Saturday has an atmospheric pressure loss of at least 24 hectopascals (hpa) in less than 24 hours. This is the main criterion for a “weather bomb”.
Between Friday December 19 and Saturday December 20, The Weather Network forecasts a drop in the barometer from 982 hpa to 954 hpa. That’s an atmospheric pressure loss of 28 hpa in less than 24 hours. Tick…tick…
Cold air, warm air – all mixing together to create a storm that will hit Montreal from Friday December 20.
Forecast and recommendations
Over the next two days, the wind picks up and gusts will reach 64 km/h in Montreal. For reference, we are now on yellow alert, with wind gusts of 10 km/h this Thursday, December 18.
In addition to the very strong wind – which could cause power outages throughout the region – 20mm of rain is expected to fall on the city, so extra caution is advised on the roads on Friday and Saturday.
The good news is that the calm after the storm is forecast, with a cold snap and snow arriving from next Monday…
Take care, and we’ll stay dry if we can,