The BC River Forecast Centre has issued a High Streamflow Advisory for parts of the South Coast, including rivers and tributaries around Howe Sound, the Sunshine Coast, the Sea-to-Sky region, the North Shore mountains and Lower Fraser tributaries such as the Lillooet River near Pemberton and waterways across the Fraser Valley.
The advisory comes as a frontal system brings steady rainfall to the region today and Friday. Environment and Climate Change Canada has issued rainfall warnings, with up to 50 millimetres of rain expected, and potentially more over higher terrain. Rising temperatures may also trigger mid-elevation snowmelt.
Local rivers are already running at seasonal to above-seasonal levels following several weeks of wet weather. Waterways are expected to rise rapidly on Thursday, with peak levels forecast late Thursday into Friday. Hydrologic modelling indicates flows could reach the 2-year to 5-year range, which may be the highest of the season for some areas.
Officials warn that increased rain and high streamflow can lead to unstable riverbanks, erosion, localized flooding, submerged roads, swift-water hazards and landslides. Residents are urged to stay well back from fast-moving rivers and avoid driving through flooded roads or bridges. Fallen leaves may also clog storm drains and affect urban drainage.
The River Forecast Centre says it will continue to monitor conditions and provide updates as needed.
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