Flood Warnings and Advisories

Flood Watch – Shuswap River
High Streamflow Advisory – South Thompson River (ISSUED), Salmon River (DOWNGRADED), Okanagan (DOWNGRADED) Central Interior (DOWNGRADED), Similkameen (DOWNGRADED), North Thompson, Thompson River
UPDATED: 11:00h May 22nd, 2018
                            
The following Flood Warnings, Watches and Advisories in the Central region are in effect as of Tuesday, May 22nd 11:00hr:

  • Flood Watch – Shuswap River
  • High Streamflow Advisory (ISSUED) – South Thompson River including Shuswap Lake
  • High Streamflow Advisory (DOWNGRADED) - Salmon River near Falkland and Salmon River near Salmon Arm
  • High Streamflow Advisory (DOWNGRADED) – Okanagan including Mission Creek and tributaries in the Vernon, Kelowna, Penticton, Oliver and surrounding areas
  • High Streamflow Advisory (DOWNGRADED) – Similkameen River and tributaries including the Tulameen River
  • High Streamflow Advisory (DOWNGRADED) – Central Interior including the Nicola River, Coldwater River, Bonaparte River, Guichon Creek and tributaries in the Merritt, Kamloops, Cache Creek and surrounding areas
  • High Streamflow Advisory - North Thompson River and tributaries including the Clearwater River
  • High Streamflow Advisory - Thompson River near Spences Bridge

In most areas river levels have declined with easing temperatures and dwindling snow packs. Through the North Thompson and South Thompson Rivers and tributaries, snow packs are still sufficient at mid to upper elevations to contribute to flood risk from snow melt. Flows on the Shuswap River remain high due to increased snowmelt runoff from the headwaters.
Temperatures are expected to remain high through Wednesday and into Thursday this week, with increased snow melt expected in the areas where snow remains.
A summary of key rivers includes:

  • Thompson River near Spences Bridge (08LF051) is flowing at 3,400 m3/s (5-year flow).  Flows are expected to remain elevated near this level through the week
  • North Thompson River at McLure (08LB064) is flowing at 2,075 m3/s (5-year flow) and receding.  Additional rises are expected with increased snow melt runoff this week, and rises up to or exceeding last week’s levels (2250 m3/s) are possible later this week
  • Shuswap River near Enderby (08LC002) is flowing at approximately 500 m3/s (5-year flow) and remains fairly level. Snowmelt runoff this week is expected to maintain high flows through this week, with additional rises possible later in the week
  • South Thompson River at Chase (08LE031) is currently flowing at 1150 m3/s (5-year flow) and rising. Continued rises are expected through this week, with flows in the 1300 m3/s range forecasted by the weekend or into next week

In other areas, including the Okanagan, Central Interior (Nicola, Coldwater) and Similkameen, small rises are possible this week with warming temperatures, however flows are not expected to reach levels experienced last week or earlier. Rainfall remains a risk throughout the region for potential flooding over the coming few weeks, however at this time no significant rainfall patterns are in the weather forecast over the next few days.
The River Forecast Centre will continue to monitor conditions and update this advisory as conditions warrant.


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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