Residents of British Columbia's South Coast are preparing for a significant and prolonged soaking this weekend as a powerful atmospheric river takes aim at the region. Environment and Climate Change Canada has issued a formal rainfall warning, forecasting a deluge that could see totals reach up to 125 millimetres in some areas before the system moves out.
Rainfall Warning Details and Affected Areas
The federal weather agency posted the warning on Saturday, specifying a broad swath of Metro Vancouver and surrounding regions. The communities under the warning include Surrey, Langley, Burnaby, New Westminster, the Tri-Cities, Maple Ridge, the North Shore, and Howe Sound. The heaviest downpours are anticipated to arrive on Sunday, with the persistent rain continuing through Monday.
Forecasters predict total rainfall accumulations will range between 75 and 125 mm from Saturday through to Monday night. While the rain will be steady, the most intense period is expected during the day on Sunday. A gradual easing is forecast, with the heavy rain expected to taper off by Monday night.
Potential Impacts and Public Safety Advisories
Environment Canada is cautioning the public about several potential hazards associated with this significant weather event. The primary concerns are localized flooding and pooling water on roadways and in low-lying areas. Drivers are advised to expect possible travel delays and to exercise extra caution, especially in areas prone to standing water.
A more serious risk highlighted in the warning is the potential for landslides. The agency notes that vulnerable locations, such as steep slopes, deforested areas, or recent burn scars from wildfires, are at an increased risk of failure due to the ground becoming saturated. Residents in these areas should remain vigilant.
Understanding the Atmospheric River Phenomenon
This weekend's event is driven by an atmospheric river, a long, narrow corridor in the atmosphere that transports immense amounts of water vapor from the tropics. When these "rivers in the sky" make landfall, particularly against mountain ranges like the North Shore Mountains, they are forced upward, cooling and releasing their moisture as heavy precipitation. These systems are a common feature of B.C.'s winter weather but can vary greatly in intensity.
The January 10, 2026, warning serves as a reminder for coastal communities to prepare for extreme wet weather. Residents are encouraged to clear storm drains near their properties, secure outdoor items, and stay updated on the latest forecasts and any potential evacuation orders from local authorities.
