The city of Thunder Bay says it’s ready for rain expected Tuesday, as Environment Canada predicts multiple thunderstorms in the region through the night.

The Lakehead Region Conservation Authority issued another flood watch Monday for the city and area.

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Darrell Matson, manager of infrastructure and operations, said Thunder Bay's sewage treatment plant is ready for the rain predicted by Environment Canada. (Matt Prokopchuk/CBC)

Darrell Matson, manager of infrastructure and operations, said Thunder Bay's sewage treatment plant is ready for the rain and thunderstorms that are expected to track through the area beginning Tuesday afternoon and continuing through the night into Wednesday.

Meteorologist Geoff Coulson said the special weather statement for Thunder Bay, Atikokan and much of the north shore shows rainfall amounts could be as high as 50 to 75 mm.

'Keep your fingers crossed'

While the city hasn't found the exact location of the breach that caused the facility to flood last month, Matson said other plans remain in place. The city has a temporary pump in a large sewer line — the same line that backed up and flooded homes — as a support to help move any deluge of water along.

"If it starts to rise we'll just continue to … commission that pump and pump around it," Matson said.

"That’s the contingency in place and that's how we actually got on top of the flooded 1964 plant."

Matson said city staff will monitor sewer levels throughout the city, and will keep an eye on any water level changes.

Mayor Keith Hobbs added city staff remains on alert and he's hoping for the best.

"We have … staff on 24-7 at the sewage treatment plant," Hobbs said. "Staff are going to be on high alert, and that's pretty well it. Just keep your fingers crossed."

The city's emergency operations control group will meet this morning to ensure all its plans are in place for a heavy rain.