Flood Warnings and Advisories


Central Region
Flood Watch – South Thompson River (Maintained), North Thompson River (UPGRADED), Thompson River at Kamloops (UPGRADED)
High Streamflow Advisory – Tributaries of South Thompson (MAINTAINED), Thompson River at Spences Bridge (MAINTAINED)
ISSUED: 3:30 PM June 30th, 2020

The River Forecast Centre is maintaining or upgrading to a Flood Watch for:

  • South Thompson River
  • North Thompson River including Blue River, Clearwater River and surrounding tributaries
  • Thompson River at Kamloops and downstream to Spences Bridge

The River Forecast Centre is maintaining a High Streamflow Advisory for:

  • Tributaries of the South Thompson including Shuswap River, Shuswap Lake, Adams River
  • Thompson River at Spences Bridge

Larger river systems in the Thompson reached up to 10-year and 20-year flows over the past weekend due to snowmelt and rainfall from last week.  A significantly stronger and more widespread system is forecast to distribute heavy rainfall over the Wednesday through Friday period.  Flows are expected to increase to the highest levels of year for the North Thompson River, South Thompson River and the Thompson River at Kamloops.

Most recent observations are:

  • North Thompson River at Birch Island (08LB047) is flowing at 466 m3/s (1-year flow)
  • North Thompson River at McLure (08LB064) is flowing at 1650 m3/s (between a 1-year and 2-year flow)
  • Clearwater River near Clearwater Station (08LA001) is flowing at 990 m3/s (2-year flow)
  • South Thompson at Chase (08LE031) is flowing at 1285 m3/s (10-year flow)
  • Thompson River near Spences Bridge (08LF051) is flowing at 3350 m3/s (between a 5-year and 10-year flow)

A widespread rainfall event is forecast for the Wednesday through Friday period.  Regions of the North Thompson are forecast to receive up to 50-70 mm of rainfall.  Today’s CLEVER model forecast is predicting that flows on the North Thompson could reach greater than a 100-year flow.  The response on the South Thompson River is not expected to increase as dramatically.  The combined high flows forecast for the North Thompson River and South Thompson River could result in significantly high levels for the Thompson River at Kamloops over the weekend.

The public is advised to stay clear of the fast-flowing rivers and potentially unstable riverbanks during the high-streamflow period.
The River Forecast Centre continues to monitor the conditions and provides updates as conditions warrant.

BC River Forecast Centre

Ministry of Forests, Lands, Natural Resource Operations and Rural Development

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. 

The public is advised to stay clear of the fast-flowing rivers and potentially unstable riverbanks during the high-streamflow period.

The River Forecast Centre continues to monitor the situation and provides updates as conditions warrant.

Contact for Media Relations, Ministry of Forests, Lands, Natural Resource Operations and Rural Development:
Tel: 250-213-8172

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. This is the lowest level.
  2. Flood Watch: River levels are rising and will approach or may exceed bankfull. Flooding of areas adjacent to affected rivers may occur. This is the intermediate level.
  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. This is the highest level.

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