UPDATE - High Streamflow Advisory: South Coast
ISSUED: October 14 2016 3:30PM
The BC River Forecast Centre is maintaining a High Streamflow Advisory for the South Coast including:
- Howe Sound and Sea to Sky including the Squamish River, Stawamus River, Cheakamus River, Lillooet River and surrounding creeks and tributaries;
- North Shore Mountains including the Seymour River and surrounding creeks and tributaries; and
- Fraser Valley including the Chilliwack River and surrounding creeks and tributaries.
The second of three Pacific storms is now passing across the south coast of British Columbia. Rainfall totals over the past 48 hours have been in the 40-100mm range across the region, with the highest amounts observed over Howe Sound, North Shore Mountains and areas north of the Lower Mainland and Fraser Valley.
Rivers have responded to this rainfall, with water levels still rising through the region. While flows are high, they are currently well below 2-year return period flows and well below flood stage.
Rain from the current storm system is expected to ease Friday evening, before a third storm arrives later on Saturday. The third system contains remnants of Tropical Storm Songda, and is expected to bring strong winds and moisture to the South Coast. Heavy rain is expected Saturday evening through Sunday, with current forecasts from Environment Canada indicating the potential for an additional 40-120mm or more over the region, with the highest amounts over Howe Sound, North Shore Mountains and mountains along the north of the Lower Mainland.
Rivers may experience a brief reprieve overnight Friday and early Saturday before Saturday’s storm arrives. Additional rises in river levels are expected overnight Saturday and through the day on Sunday.
The public is cautioned to stay clear of rivers during rain events due to quickly flowing water and potentially unstable riverbanks.
Current public weather alerts from Environment and Climate Change Canada can be found by following this link.
The River Forecast Centre will continue to monitor conditions and will provide updates as conditions warrant.
A High Streamflow Advisory means that river levels are rising or expected to rise rapidly, but that no major flooding is expected. Minor flooding in low-lying areas is possible.
A Flood Watch means that river levels are rising and will approach or may exceed bankfull. Flooding of areas adjacent to affected rivers may occur.
A Flood Warning means that river levels have exceeded bankfull or will exceed bankfull imminently, and that flooding of areas adjacent to the rivers affected will result.