A “prolonged atmospheric river event” is not letting up on B.C.’s South Coast, according to Environment Canada, and the rain just keeps coming.

Periods of heavy rain are expected from Wednesday to Friday in the northern areas of Metro Vancouver and Howe Sound, as well as inland and western Vancouver Island.

Environment Canada has issued multiple rainfall warnings.

The agency is warning that extensive water pooling on roads is possible and there is an enhanced risk of landslides.

In western and inland Vancouver Island, Environment Canada noted the rain is expected to ease briefly Wednesday morning before intensifying again from Wednesday afternoon to Friday “under the influence of the atmospheric river.”

“The heaviest rainfall is expected Thursday night into Friday morning,” according to the warning.

The Fraser Valley is expecting up to 100 millimetres of rainfall between Tuesday night and midday Thursday, and larger amounts are possible near the mountains.

Rain falling on top of snow, combined with mountain snow melt, could lead to flooding.

Parts of the Central Coast are also under a rainfall warning, south of Bella Bella near Rivers Inlet.

Environment Canada said between 150 and 200 mm of precipitation is expected for coastal communities, and up to 250 mm is forecast over the mountains “except locally higher amounts approaching 300 mm.”

Environment Canada has urged caution to drivers, noting localized flooding in some areas is likely and some roads may become impassable.

“Landslides may occur in vulnerable areas such as steep slopes, deforested areas or recent burn scars.”