Environment Canada issued a rainfall warning for London-Parkhill-Eastern Middlesex County on Tuesday.
Predictions indicate total rainfall amounts of 50 to 60 millimetres.
According to Environment Canada, showers and isolated thunderstorms will move across the region as a cold front approaches from the west.
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“Heavy downpours can cause flash floods and water pooling on roads,” Environment Canada said. “Localized flooding in low-lying areas is possible.”
The warning comes after hundreds of Londoners braced for the rain Monday while attending a vigil to honour the anniversary of the Afzaal family death in London, Ont.