SUDBURY -- Environment Canada says rain and thunderstorms will continue in the North Bay and West Nipissing areas Tuesday morning.

Very heavy downpours giving 25 mm of rain in under an hour and frequent lightning are possible.

Total rainfall amounts of 20 to 30 mm are likely, with local amounts of 30 to 50 mm possible by the time this area of showers and thunderstorms moves out later this morning.

Motorists should be prepared for sudden very low visibility in heavy downpours. Ponding of water on poorly drained sections of highways may be an issue to deal with.