Flood Warnings and Advisories

Central Region – Flood Watch - Salmon River, Bonaparte River; High Streamflow Advisory – North Thompson (NEW), South Thompson (NEW), Shuswap (NEW), Similkameen (NEW), North Okanagan, Nicola River
ISSUED: 3:30 PM May 28, 2020
 
The River Forecast Centre is maintaining a Flood Watch for:

  • Salmon River near Salmon Arm
  • Bonaparte River

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

  • North Thompson River including mainstem and Clearwater River (NEW) and smaller tributaries (MAINTAINED)
  • South Thompson River including Shuwap River and tributaries (NEW)
  • Similkameen and tributaries including the Ashnola River (NEW)
  • North Okanagan including tributaries around Vernon, Lumby and Winfield (MAINTAINED)
  • Nicola River including Upper Nicola River above Nicola Lake and downstream through Spences Bridge (MAINTAINED)

River levels have remained elevated due to on-going snowmelt and episodes of precipitation. Some rivers have experienced more rapid rises earlier in the week in response to rainfall last weekend and through the early part of the week.

A high-pressure system is building, and temperatures are expected to rise into Saturday, with temperatures in valley bottom locations reaching up to the low-to-mid 30C range. In areas with some mid-elevation snowpack remaining, rivers levels may see additional rises through the rest of the week; this includes the Bonaparte River, Nicola River, Salmon River, tributaries in the North Thompson River and in the North Okanagan and Shuswap Region. In areas with higher elevation terrain, on-going rises in river levels are expected due to accelerated snowmelt. This includes the South Thompson River and tributaries, including the Shuswap River, North Thompson River including the Clearwater River, and Similkameen River.

Following this hot spell, weather is expected to transition to a low pressure trough and cold front. This brings the potential for thundershowers ahead of the trough on Saturday evening, transitioning to more organized rainfall overnight Saturday and into Sunday. Exact amounts of rainfall and locations of highest rainfall amounts is still uncertain, however current weather modelling is indicating the potential for moderate to high rainfall amounts (as low as 5-15mm to as high as 30-40+mm) exists throughout the region over this time frame. If high rainfall amounts materialize, flood conditions are likely to occur, particularly in areas that already have elevated river levels.

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: 250 356-7506

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. 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