Environment Canada has issued a Rainfall Warning for Perth and Huron Counties.
The agency says an Alberta clipper and a Texas low are going to merge and intensify bringing strong winds and significant precipitation.
The storm is expected to begin around midday tomorrow and carry on until Friday.
Thunderstorms are a possibility and Environment Canada is expecting between 25 and 50 mm of rain and winds gusting up to 80 km/h.
Environment Canada is monitoring the situation.
