8:09 PM EDT Friday 30 August 2024 Severe Thunderstorm Warning in effect for: Sarnia - Petrolia - Western Lambton County At 8:09 PM EDT, Environment Canada meteorologists are tracking a severe thunderstorm capable of producing very strong wind gusts, up to toonie size hail and heavy rain. This severe thunderstorm is located near Courtright, moving east at 45 km/h. Hazard: Toonie size hail and 90 km/h wind gusts. Locations impacted include: Petrolia, Sombra, Courtright, Corunna, Wilkesport, Brigden and Oil City. 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. Take cover immediately, if threatening weather approaches. 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. Please continue to monitor alerts and forecasts issued by Environment Canada. To report severe weather in Ontario, send an email to ONstorm@ec.gc.ca or tweet reports using #ONStorm . For more information: ontario.ca/page/be-prepared-emergency . Watches 4:50 PM EDT Friday 30 August 2024 Severe Thunderstorm Watch in effect for: Sarnia - Petrolia - Western Lambton County Conditions are favourable for the development of severe thunderstorms that may be capable of producing strong wind gusts and heavy rain. Hazards: Wind gusts up to 90 km/h. Heavy rain, 30 to 50 mm per hour. Risk of a tornado. Timing: Late this afternoon through this evening. Discussion: A cold front is expected to track east across the region this afternoon and evening. Thunderstorms are expected to develop ahead and along this front. The main threats with these thunderstorms are strong wind gusts and heavy rain. Small hail is also possible. The threat of a tornado cannot be ruled out. 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. Remember, severe thunderstorms can produce tornadoes. Heavy downpours are likely to cause flash floods and water pooling on roads. Lightning kills and injures Canadians every year. Remember, when thunder roars, go indoors! Stay indoors when a thunderstorm strikes. There isn''t a place outside that is safe during a thunderstorm. 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 ONstorm@ec.gc.ca or tweet reports using #ONStorm . For more information: ontario.ca/page/be-prepared-emergency .