A heavy rainfall warning has been issued for the Ottawa and Gatineau regions on Saturday.

The advisories posted by Environment Canada on Friday projected between 20 and 40 millimetres of rain, a situation that would be complicated by the ground’s limited ability to absorb further moisture following other recent rainfall events.

According to the weather agency, a Colorado low-pressure system was expected to bring rain to the national capital region starting Saturday afternoon, but the heaviest precipitation was forecast for the evening and overnight.

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Water will likely pool on roads and in low-lying areas, and visibility will likely be reduced at times, Environment Canada said, adding that thunderstorms were possible in some area.

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