A special weather statement remains in effect, calling for heavy rain starting Friday.
Environment Canada says this could cause more localized flooding.
Sand and sandbags are being made available by municipalities throughout the region.
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The rain is expected to continue into Saturday.
Environment Canada has revised its estimates and now says up to 70 millimetres of rain could fall in some areas.
The statement is expected to be upgraded to a warning tonight.
All of eastern Ontario is currently under the weather statement.