Sun. Aug 19th, 2018

Snowfall Warning Issued – 10-20cm – possible Freezing Rain

  • Vancouver Island Inland Sections Forecast - SPECIAL AIR QUALITY STATEMENT IN EFFECT
    Issued: 9:16 PM PDT Saturday 18 August 2018

    Forecast Issued 4:00 PM PDT Saturday 18 August 2018 - Saturday night: Clear. Local smoke. Low 11. Sunday: Sunny. Local smoke. High 33. Humidex 36. UV index 7 or high. Sunday night: Clear. Local smoke. Low 12. Monday: Sunny. High 34. Monday night: Clear. Low 12. Tuesday: Sunny. High 34. Tuesday night: Clear. Low 13. Wednesday: Sunny. High 24. Wednesday night: Cloudy periods. Low 14. Thursday: Cloudy with 60 percent chance of showers. High 21. Thursday night: Cloudy periods. Low 13. Friday: A mix of sun and cloud. High 20.

  • Current Conditions
    Temperature
    19.4° C
    -0.9 ° C/hr
    Barometer
    101.9 kPa
    0.0
    Wind
    N/A 0.0 km/h
    gusting 0.0 km/h
    Humidity
    66 %
    Rain Rate
    0.0 mm/hr
    Wind Chill
    19.4° C
    Heat Index
    19.4° C
    Dewpoint
    12.9° C
    UV
    0.0
    Solar
    0 W/m2
    Last Updated: 22:55:00 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
    05:39
    Moon Phase
    First quarter (59% full)
    Civil Set
    21:05
    Day Length
    13:22:59
    Day High
    29.8° C @ 15:23 Tdy.
    Day Low
    11.7° C @ 06:30 Tdy.
    Day High Rain Rate
    0.0mm/hr00:00
    Day High Barometer
    102.42 kPa @ 07:58 Tdy.
    Day Low Barometer
    101.79 kPa @ 19:44 Tdy.
    Day Low Windchill
    11.7° C @ 06:30 Tdy.
    Day High Heat Index
    29.8° C @ 15:23 Tdy.
    Day High Wind Gust
    S 16.3km/h @ 16:05 Tdy.
    Day High Solar Radiation
    1220W/m2 @ 13:26 Tdy.
    Day High UV Index
    7.8 @ 13:25 Tdy.

Final Update 9PM Sunday

The warm winds have come. We have gone from 0°C to 4°C in less than 30 minutes and the wind has switched to the SSW.  Strong winds are reported on the East side. 50-60kph at Hornby Island.

Expect the Snowfall Warning to be lifted soon.

Update 12PM

Drizzle is starting in some parts of town, ice pellets at Alberniweather. Totally dependent on local temperature and how hard it is precipitating. Heavier it is, more it will cool the air and turn to snow as long as we are within a degree or two of freezing.

Update 9AM Sunday

We received just a small amount of snow overnight but the main precipitiation is still yet to come.  EC expects us to stay at or below freezing and for everything to fall as snow until later tonight.

It should begin to snow more heavily around noon and then pick up steam through the rest of the day and also gradually warm. Strongest precipitation will be tonight around 3AM. That should be past the point of warming and should be rain. We shall see.

Stay safe on the roads. So far, they are pretty good.

 

 

 

 

 

 

Environment Canada has issued a snowfall warning for Port Alberni and all of Vancouver Island except Northern sections.

They forecast 10-20cm of snow but the models are very very uncertain on how the warm air will interact with the entrenched cold air.   5-10cm is expected in coastal areas.

Some models have us above zero right away over night, those are the freezing rain and rainy ones.  Others have us staying cold.  Those are the snowy ones.

The precip will start after midnight tonight.  The short term models that are closer to present time have us warming almost right away and less snow. The longer term ones that are from 10AM today have us cooler and snowier.

I am inclined to go with the broader long term ones that has us snowier, like EC but I would also be very wary of thr possibility of freezing rain in Port Alberni. So be careful out there!

Here are all the different options:

The High Resolution and short term HRRR model has us warming to 2 °C by 7AM Sunday but produces freezing rain overnight tonight into Sunday morning.

The short term RAP is similar.

The Canadian GEM is very different, it expect us to stay cold throuh Sunday and as a result has 12cm of snow falling. This is clearly the one EC is banking on.

The US NAM is more on the warm and wet side but has quite a mix.

The US GFS is also on the cool side but has less precipitation actually falling so less snow overall but definitely on the cool side.

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