Environment Canada says tornados possible in Petrolia and Central Lambton

ALERT: TORNADO WATCH IN EFFECT FOR LAMBTON COUNTY CHATHAM KENT AND WINDSOR-ESSEX
Conditions are favourable for the development of severe thunderstorms which may produce tornadoes.
Severe thunderstorms are expected to develop late this afternoon and evening ahead of a cold front. Damaging winds to 90 km/h and large hail are possible. There is also the risk of a tornado.
Be prepared for severe weather. Take cover immediately, if threatening weather approaches.
In the event of a tornado, or if a tornado warning is issued for your area, it is recommended you take the following actions: Go indoors to a room on the lowest floor, away from outside walls and windows, such as a basement, bathroom, stairwell or interior closet. Leave mobile homes, vehicles, tents, trailers and other temporary or free-standing shelter, and move to a strong building if you can. As a last resort, lie in a low spot and protect your head from flying debris.
The Office of the Fire Marshal and Emergency Management recommends that you take cover immediately, if threatening weather approaches