On Sept. 17, Coquitlam saw 106.3 mm of rain accumulated at its Burke Mountain gauge during a heavy rainfall warning by Environment Canada.
If the current forecast rings true, there could be the same amount falling this weekend across the Tri-Cities.
As of 3:40 p.m. today (Sept. 25), Environment Canada has placed a rainfall warning in effect for Metro Vancouver, including its northeast section of Coquitlam, Port Coquitlam, Port Moody, Anmore and Belcarra.
According to the national service, up to 70 mm of rain is expected to downpour most of Sunday (Sept. 26) before easing off into the early hours of Monday (Sept. 27).
Meteorologists explain a "moisture-laden" frontal system is on the move to B.C.'s south coast, which may also bring winds gusting up to 60 km/h tomorrow.
"Heavy downpours can cause flash floods and water pooling on roads," Environment Canada says.
"If visibility is reduced while driving, turn on your lights and maintain a safe following distance."
Whenever the heavy rain subsides, the wet weather is expected to continue in the days ahead concluding the month of September.
Showers are expected Monday through Friday with temperatures hovering between 10 and 20 C at days' peak.