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

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

    Forecast Issued 4:00 PM PDT Sunday 20 May 2018 - Sunday night: Partly cloudy. Fog patches developing overnight. Low 9. Monday: Clearing in the morning. Fog patches dissipating in the morning. High 24. UV index 7 or high. Monday night: Clear. Low 9. Tuesday: Sunny. High 28. Tuesday night: Clear. Low 12. Wednesday: Sunny. High 29. Wednesday night: Clear. Low 11. Thursday: A mix of sun and cloud. High 27. Thursday night: Cloudy periods. Low 11. Friday: Sunny. High 22. Friday night: Clear. Low 11. Saturday: Sunny. High 23.

  • Current Conditions
    Temperature
    17.1° C
    0.1 ° C/hr
    Barometer
    101.69 kPa
    0.0
    Wind
    SSW 16.9 km/h
    gusting 27.4 km/h
    Humidity
    66 %
    Rain Rate
    0.0 mm/hr
    Wind Chill
    17.1° C
    Heat Index
    17.1° C
    Dewpoint
    10.7° C
    UV
    1.2
    Solar
    365 W/m2
    Last Updated: 18:20:00 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
    04:49
    Moon Phase
    Waxing crescent (38% full)
    Civil Set
    21:43
    Day Length
    13:15:45
    Day High
    18.6° C @ 15:56 Tdy.
    Day Low
    12.5° C @ 05:28 Tdy.
    Day High Rain Rate
    0.0mm/hr00:00
    Day High Barometer
    101.7 kPa @ 13:59 Tdy.
    Day Low Barometer
    101.43 kPa @ 00:00 Tdy.
    Day Low Windchill
    12.5° C @ 05:28 Tdy.
    Day High Heat Index
    18.6° C @ 15:56 Tdy.
    Day High Wind Gust
    S 18.3km/h @ 13:25 Tdy.
    Day High Solar Radiation
    1283W/m2 @ 15:26 Tdy.
    Day High UV Index
    7.6 @ 14:05 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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