Severe thunderstorm warning issued for Ottawa area

Ottawa severe thunderstorm watch

OTTAWA, ON., September 15, 2021 – At 12:04 a.m. EDT, Environment Canada meteorologists are tracking a severe thunderstorm capable of producing very strong wind gusts, nickel to ping pong ball size hail and heavy rain.

This line of severe thunderstorms is located from 9 kilometres north of Kanata to 8 kilometres south of Scarborough to 25 kilometres south of Long Point, moving southeast at 70 km/h.

The storms are expected to move into eastern Ontario early overnight and reach southern Quebec during the overnight period.

Severe thunderstorm watch in effect for:

  • Ottawa North – Kanata – Orléans
  • Ottawa South – Richmond – Metcalfe

Environment Canada warns of 90 km/h wind gusts and nickel size hail.

Locations impacted include:
Ottawa, St. Catharines, Niagara Falls, Pickering, Oshawa, Cobourg, Belleville, Kingston, Brockville, Cornwall, Cayuga, Stoney Creek, Dunnville, Smithville, Lincoln, Downtown Toronto, Port Colborne, Welland, Ajax and Whitby.

Power outages are possible.

Take cover immediately, if threatening weather approaches. Heavy downpours can cause flash floods and water pooling on roads. If visibility is reduced while driving, turn on your lights and maintain a safe following distance. Strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles. Intense lightning is likely with any thunderstorm that develops.

It is important to keep in mind that severe thunderstorms can also produce tornadoes.

Severe thunderstorm warnings are issued when imminent or occurring thunderstorms are likely to produce or are producing one or more of the following: large hail, damaging winds, torrential rainfall.

The Office of the Fire Marshal and Emergency Management recommends that you take cover immediately if threatening weather approaches.

Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather, send an email to or tweet reports using #ONStorm.

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