Skip to content

Conditions favourable for the development of severe thunderstorms

Strong wind gusts, large hail and heavy rain possible, says Environment Canada
20210707 thunderstorm 1 turl
Thunderstorm over Lake Nipissing. File photo.

Severe thunderstorm watch issued for:
   Vaughan - Richmond Hill - Markham, Ont.
   Owen Sound - Blue Mountains - Northern Grey County, Ont. 
   Listowel - Milverton - Northern Perth County, Ont. 
   Stratford - Mitchell - Southern Perth County, Ont. 
   Waterloo - Wellington, Ont. 
   Halton Hills - Milton, Ont. 
   Burlington - Oakville, Ont. 
   Niagara, Ont. 

Current details:
Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts, large hail and heavy rain.

90 km/h wind gusts
Up to toonie sized hail

This afternoon.

Thunderstorms will develop along a cold front that will move through the province this afternoon.

Large hail can damage property and cause injury. Strong wind gusts can toss loose objects, damage weak buildings, break branches off trees and overturn large vehicles. Heavy downpours can cause flash floods and water pooling on roads. Water-related activities may be unsafe due to violent and sudden gusts of wind over bodies of water.

Lightning kills and injures Canadians every year. Remember, when thunder roars, go indoors!

Emergency Management Ontario recommends that you take cover immediately if threatening weather approaches.

Severe thunderstorm watches are issued when atmospheric conditions are favourable for the development of thunderstorms that could produce one or more of the following: large hail, damaging winds, torrential rainfall.

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

For more information:


What's next?

Reader Feedback
push icon
Be the first to read breaking stories. Enable push notifications on your device. Disable anytime.
No thanks