ENVIRONMENT Canada on Sunday announced a total rainfall up to 120 to 160 mm for Metro Vancouver, western Fraser Valley, Whistler, Howe Sound and parts of the Sunshine Coast; and a total rainfall up to 200 to 230 mm for central and eastern Fraser Valley by Monday afternoon. Warm temperatures will accompany the rain.

Locations: Metro Vancouver, Fraser Valley, Howe Sound, Sea to Sky – Squamish to Whistler, Whistler, Sunshine Coast – Gibsons to Earls Cove.

There will be rising freezing levels with melting snow giving rise to increased river flows and localized flooding.

A significant atmospheric river event is bringing copious amounts of rain and near record temperatures to the B.C. south coast from Sunday night to Monday afternoon.

Heavy rain will continue Sunday and ease early Monday afternoon as the system moves through the region. The highest rainfall amounts of 100 to 130 mm have been observed over central and eastern Fraser Valley so far. Additional rainfall amounts near 100 mm are expected by Monday afternoon. The rest of the regions has received 60 to 90 mm with further rainfall amounts of near 70 mm expected.

This long episode of heavy rain could result in possible washouts, debris flow and pooling water as rising freezing levels will also melt snow at higher elevations. Local river levels will rise and river flows will increase as a result of the heavy rain.

Heavy downpours can cause flash floods and water pooling on roads. Localized flooding in low-lying areas is possible. Watch for possible washouts near rivers, creeks and culverts.