Ottawa-Gatineau residents kept one eye on the sky this week after Environment Canada slapped a severe thunderstorm warning on the capital region, only to lift it a few hours later once the worst had rumbled through.
What happened
Environment Canada issued the warning Tuesday afternoon as it tracked a severe thunderstorm rolling across the Ottawa-Gatineau area. At its peak, the agency said the system was capable of producing hail up to quarter-size and very heavy rain — as much as 50 millimetres in a short window. That's the kind of sudden, intense downpour that can overwhelm storm drains, pool on roadways and turn a routine commute into a white-knuckle drive.
The alert covered both sides of the Ottawa River, meaning communities in Ontario and western Quebec were all under the same advisory. By just before 6:30 p.m., Environment Canada cancelled the warning on both sides of the river, signalling the threat had passed.
Why these warnings matter in Ottawa
If it feels like Ottawa has been getting more of these fast-moving summer storms, you're not imagining things. The capital sits in a corridor that regularly sees pop-up thunderstorms through the warmer months, and Environment Canada upgrades a watch to a warning when a storm is either imminent or already happening. A warning is your cue to take it seriously — head indoors, stay away from windows, and unplug sensitive electronics until it blows over.
Quarter-sized hail might sound minor, but it's enough to dent vehicles, shred garden plants and damage soft-top patios. And 50 mm of rain in a hurry is exactly the recipe for flash flooding in low-lying spots and underpasses around the city.
What to do next time
Ottawa's summer storm season is far from over, so it's worth having a plan. A few quick tips:
- Sign up for alerts. Environment Canada's weather alerts and apps like WeatherCAN push warnings straight to your phone.
- When thunder roars, go indoors. The old rule still holds — if you can hear thunder, you're close enough to be struck by lightning.
- Give yourself extra time. Heavy rain cuts visibility fast on highways like the 417 and the Queensway. Slow down and leave room.
- Secure the patio. Umbrellas, lightweight furniture and BBQ covers can become projectiles in a sudden gust.
The good news this time: the storm moved through quickly and the all-clear came before the dinner hour. But with more humid, unstable air expected through the season, it likely won't be the last warning Ottawa-Gatineau sees this summer.
Source: CBC News Ottawa via Google News.
