Environment Canada issued a special weather statement Friday afternoon for most of southern Ontario.
The weather office talked about the risk of funnel clouds developing for a region that covered Sarnia, London, Huron, Perth, Grey Bruce and Simcoe counties.
Environment Canada said the conditions were favourable for the development of funnel clouds or weak thunderstorms.
There have been no reports of funnel clouds or tornadoes.
The warning was issued at 1:30 PM and was in effect until 3:30 PM.