Flood Warnings and Advisories

High Streamflow Advisory – South Coast and Vancouver Island
ISSUED: 2:00 PM December 12, 2018

The River Forecast Centre is issuing a High Streamflow Advisory for the South Coast and Vancouver Island including:

  • Metro Vancouver - including the Serpentine and Nicomekl Rivers and local streams
  • Howe Sound – including the Stawamus River and tributaries along the Sea-to-Sky Highway
  • Sunshine Coast – including watersheds around Gibsons and Sechelt
  • North Shore – including the Seymour River and watersheds around North Vancouver and West Vancouver
  • Fraser Valley (North) – including mountainous tributaries from Coquitlam to Harrison
  • West Vancouver Island – including tributaries around Gold River, Zeballos, Tofino and surrounding areas
  • Central Vancouver Island – including the Sproat and Somass Rivers and areas surrounding Port Alberni
  • East Vancouver Island – including tributaries around Campbell River, Courtenay, Parksville, Nanaimo and surrounding areas
  • Southern Vancouver Island – including the Cowichan River, Chemainus River and surrounding tributaries

A series of powerful Pacific storms continue to impact British Columbia. Following heavy rainfall yesterday, another storm is expected to arrive to south-west BC overnight Wednesday into Thursday. Moderately heavy rainfall is expected with this storm, along with a slight rise in temperatures. Over higher terrain, precipitation is expected to remain as snow, however mid-elevations (<1400m) may see minor melt of snow that has accumulated over the past day. An additional storm is expected to arrive later on Friday.

Streamflow is expected to rise in response to these storms, with high flows expected on Thursday. Rivers will have a reprieve later on Thursday or into Friday, before another round of precipitation arrives. Current hydrological modelling is indicating the potential for streamflow in the 2-year to 5-year return period range, and possibly higher, over the Thursday-Friday period.

The River Forecast Centre will continue to monitor conditions and update this advisory as conditions warrant.

Contact for Media Relations, Ministry of Forests, Lands, Natural Resource Operations and Rural Development:
Tel: 250 356-7506

Levels of Warnings/Advisories:

  1. High Streamflow Advisory: River levels are rising or expected to rise rapidly, but that no major flooding is expected. Minor flooding in low-lying areas is possible.
  2. Flood Watch: River levels are rising and will approach or may exceed bankfull. Flooding of areas adjacent to affected rivers may occur.
  3. Flood Warning: River levels have exceeded bankfull or will exceed bankfull imminently, and that flooding of areas adjacent to the rivers affected will result.

Links:

  1. Home of River Forecast Centre
  2. Current Streamflow Conditions and Flood Forecast Modeling
  3. Map of Current Streamflow Return Periods for All WSC Stations
  4. CLEVER Model 10-day Forecasts of Discharges and Return Periods
  5. COFFEE Model 5-day Forecasts of Discharges and Return Periods
  6. Back to page of Flood Warnings and Advisories