Across northwestern Ontario, 10 to 20 mm are possible today. Locally higher amounts are possible with thunderstorms.
On Thursday, rainfall amounts of 15 to 25 mm are possible. Locally higher amounts with thunderstorms across northeastern Ontario.
In southern Ontario there is a slight risk of severe thunderstorms east of line from Delhi through the GTA then northeastwards to Petawawa. The main threat is strong wind gusts.