High Streamflow Advisory Issued

  • Vancouver Island Inland Sections Forecast - No watches or warnings in effect.

    Forecast Issued 05:00 AM PDT Sunday 22 July 2018 - Sunday: Sunny. High 31. Humidex 33. UV index 8 or very high. Sunday night: Clear. Low 13. Monday: Sunny. High 32. Humidex 33. Monday night: Clear. Low 13. Tuesday: Sunny. High 34. Tuesday night: Clear. Low 13. Wednesday: Sunny. High 35. Wednesday night: Clear. Low 13. Thursday: Sunny. High 34. Thursday night: Clear. Low 14. Friday: Sunny. High 29. Friday night: Clear. Low 15. Saturday: Sunny. High 29.

  • Current Conditions
    Temperature
    13.4° C
    0.9 ° C/hr
    Barometer
    102.38 kPa
    0.0
    Wind
    N/A 0.0 km/h
    gusting 0.0 km/h
    Humidity
    87 %
    Rain Rate
    0.0 mm/hr
    Wind Chill
    13.4° C
    Heat Index
    13.4° C
    Dewpoint
    11.3° C
    UV
    0.0
    Solar
    38 W/m2
    Last Updated: 7:00:00 PDT
    Click to Refresh or See All Conditions
  • Day Almanac
    Day's Rain
    0.0 mm
    Day ET
    0.0 mm mm
    Rain Storm
    NotAvailable mm
    Civil Rise
    04:57
    Moon Phase
    First quarter (77% full)
    Civil Set
    21:52
    Day Length
    13:25:41
    Day High
    17.4° C @ 00:00 Tdy.
    Day Low
    12.4° C @ 06:05 Tdy.
    Day High Rain Rate
    0.0mm/hr00:00
    Day High Barometer
    102.38 kPa @ 06:14 Tdy.
    Day Low Barometer
    102.3 kPa @ 00:00 Tdy.
    Day Low Windchill
    12.4° C @ 06:05 Tdy.
    Day High Heat Index
    17.4° C @ 00:00 Tdy.
    Day High Wind Gust
    S 0.0km/h @ 00:25 Tdy.
    Day High Solar Radiation
    42W/m2 @ 06:59 Tdy.
    Day High UV Index
    0.0 @ 00:00 Tdy.

See the previous post for details on the rain.  I will update this post if there is anything else significant that changes.

The River Forecast Centre has issued a High Streamflow Advisory for our region. You can see updates directly here.

The Current Advisory (Nov 21 1:41PM)

High Streamflow Advisory – Vancouver Island
ISSUED: November 21, 2017 10:15 AM

The River Forecast Centre is issuing the High Streamflow Advisories for:

  • Central Vancouver Island including Sproat River, Somass River and tributaries and areas around Port Alberni
  • Eastern Vancouver Island including the Englishman River, Tsolum River, Oyster River and tributaries around Campbell River, Comox, Parksville and surrounding areas
  • Southern Vancouver Island including the Chemainus River, Cowichan River, Koksilah River and surrounding areas

A storm cycle is expected to impact Vancouver Island over the Tuesday to Thursday period. Heavy rainfall is expected, particularly over the Tuesday to Wednesday period.  Rainfall totals are forecasted to be in the 100-150 mm range, with the potential for higher amounts where upslope conditions occur, and lower amounts along the eastern slopes of Vancouver Island. Temperatures are expected to rise sharply through Tuesday, with freezing levels approaching 3000m. Snowmelt is expected to contribute to river runoff during this storm event.

River levels are expected to rise through Tuesday, with peak levels expected on Wednesday or potentially into Thursday. Current modelling is indicating the potential for rivers to reach up to approximately 2-year return period flows, or similar levels that were experienced last weekend. On the Somass River, flows are currently forecasted to reach up to 5-year return period levels, or higher than was experienced this past weekend (e.g. similar levels to the November 2016 event). High tides and a moderate storm surge are expected through the week, particularly on Thursday, and may exacerbate river levels at river outlets.

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