Pouring rain continues to batter parts of British Columbia’s southern coast on Thursday, as a slow-moving weather system drenches communities and raises concerns about localized flooding and landslides. Persistent rainfall began earlier in the week and is expected to intensify before conditions gradually ease.

Environment and Climate Change Canada (ECCC) issued rainfall warnings on Wednesday for areas including Howe Sound and portions of Metro Vancouver’s North Shore and northeast communities. The warning zone covers municipalities such as Coquitlam and Maple Ridge, where precipitation totals are expected to be highest.

Forecasters say between 40 and 60 millimetres of rain could fall from Wednesday through Thursday night. While these totals are not unprecedented for the region during the wet season, the duration and intensity of the rainfall increase the risk of pooling water and slope instability in susceptible areas.

According to Carl Lam, meteorologist with 1130 NewsRadio, rainfall amounts will vary across the region. Communities farther south — including Tsawwassen, Langley, and Surrey — are not expected to receive as much precipitation as the North Shore and northeast sections. However, Lam emphasized that conditions will remain wet across much of the Lower Mainland, with steady rain and reduced visibility affecting daily commutes.

ECCC attributes the rainfall to a slow-moving frontal system descending across the South Coast. Because the system is progressing gradually, it is prolonging the period of steady precipitation and preventing significant clearing. Lam noted that heavier rainfall is expected to persist through Thursday, accompanied by gustier winds as the system strengthens. These wind gusts may lead to localized power outages or downed branches, particularly in exposed coastal and elevated areas.

Looking ahead, forecasters are not expecting an immediate return to dry weather. Lam indicated that another system is projected to move through the region over the weekend, bringing additional showers to Metro Vancouver. While rainfall amounts with the next system are still being assessed, early indications suggest continued unsettled conditions and limited opportunities for the ground to dry out.

Environment Canada is also warning of secondary hazards associated with prolonged rainfall. Landslides are possible in vulnerable terrain, especially along steep slopes, deforested areas, and locations with recent burn scars where vegetation that stabilizes soil may be absent. Saturated ground conditions can significantly increase the likelihood of slope failure.

In addition, the department cautions that water is likely to accumulate on roads and in low-lying areas, posing risks to drivers. Hydroplaning, reduced braking effectiveness, and poor visibility are common hazards during heavy rainfall events. Motorists are advised to allow extra travel time, reduce speed, and remain alert for changing road conditions.

Officials continue to monitor the system closely as rainfall totals accumulate, urging residents in affected areas to stay informed through weather updates and advisories.