Environment Canada meteorologist Armel Castellan predicts a closed low-pressure system will bring significant rainfall to the Lower Mainland overnight Wednesday, Dec. 18. The storm is considered an atmospheric river with subtropical origins, but impacts areas south of Metro Vancouver more heavily. While 40 to 50 mm of rainfall is expected, amounts might exceed the 50 mm threshold in West Vancouver and North Vancouver. The highest rainfall rates are anticipated midday Thursday, with up to four to five millimeters falling hourly.
Another atmospheric river is slated to drench the south B.C. coast with moisture following a sunny break.
"It is the type of atmospheric river that is beneficial to the environment," he says, adding that it shouldn't cause major flooding or last over 24 hours. "We aren't expecting to issue a rainfall warning." "We are expecting 40 to 50 mm of rainfall but amounts might cross the 50 mm threshold," he notes, adding that the West Vancouver and North Vancouver may see significantly higher amounts.
"This time will be during the early afternoon and into the evening instead of overnight,' he highlighted, adding more people may be impacted by the stormy conditions.
Atmospheric River Rainfall Weather Forecast British Columbia Storm
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