Slow-moving thunderstorms, 'very heavy downpours' forecast for Hamilton this afternoon

For the second consecutive day, thunderstorms with very heavy downpours are expected in Hamilton, Environment Canada said

Local rainfall amounts of 20 to 40 mm in an hour or less are possible

Local rainfall amounts of 20 to 40 mm in an hour or less along with wind gusts to 70 km/h are expected from some of the stronger thunderstorms. (CBC)

For the second consecutive day, thunderstorms with "very heavy downpours" are expected to hit Hamilton, Environment Canada said. 

The agency issued a special weather statement, warning isolated, slow moving storms will roll over the region this afternoon.

The thunderstorms are the result of a warm and humid tropical air mass over much of southern Ontario, according to the weather authority.

Local rainfall amounts ranging from 20 to 40 mm could fall in just an hour, along with wind gusts up to 70 km/h that are expected with some of the stronger thunderstorms. Small hail is possible.

Environment Canada says the storms could cause sudden, very low visibility and ponding of water on poorly drained areas of highways, adding the downpours may result in difficult driving conditions.

The showers and thunderstorms are expected to end this evening.