September 23, 2020

First loooong look at Christmas and Wet Sunday

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

    Forecast Issued 05:00 AM PDT Wednesday 23 September 2020 - Wednesday: Rain. Amount 15 to 25 mm. Becoming windy late this morning. High 19. UV index 1 or low. Wednesday night: Showers. Amount 10 to 15 mm. Windy early this evening. Low 12. Thursday: Showers. Amount 10 to 15 mm. High 16. UV index 1 or low. Thursday night: Showers. Low 11. Friday: Periods of rain. High 18. Friday night: Rain. Low 10. Saturday: Periods of rain. High 20. Saturday night: Rain. Low 11. Sunday: Rain. High 17. Sunday night: Cloudy with 60 percent chance of showers. Low 12. Monday: Cloudy with 60 percent chance of showers. High 18. Monday night: Cloudy periods. Low 11. Tuesday: A mix of sun and cloud. High 21.

A couple have asked, so here’s the first look, at the very edges of the forecasts… for the Christmas period.

This is the upperlevel temperature (to see if the air up high could support snow) and surface pressures for 4PM Christmas Eve Day (the furthest the models go):

Far Out Christmas Eve Pressure and highalt temp
Far Out Christmas Eve Pressure and highalt temp

What that tells me is that around Christmas Eve we may very well be in a period of cool temperatures as there looks to be a high pressure area up in Northern BC pushing down towards us and the upper level air will be around -10 which would support snow. However, there is what looks like a big storm up in the Gulf of Alaska sending a pretty strong front our way that looks like it will hit us around Christmas Day. You can see from the black 5C line that it is warm too so at this point I would say we are in for a Green Christmas.

HOWEVER πŸ™‚

This is, as I said way out at the edges of the forecast model and is very likely to completely change. So could it take it as, good chance the current pattern will continue or good chance the pattern will switch back to cold.

Just remember that we *do* live on the Wet Coast, so really the best chance for a white Christmas remains in the mountains. πŸ™‚

As for the more immediate future. We have the makings of a very wet Saturday night and Sunday.

Here is the NOGAPS model for Sunday morning the 12th (Purple is 50mm in 12hrs):

NoGaps precip forecast Dec 11 4PM
NoGaps precip forecast Dec 11 4PM

The GFS model on the other hand has the brunt of that storm hitting Washington and Oregon and saving the heavy rain for us for Monday morning. Here is Monday morning:

GFS Model Monday 13th precip
GFS Model Monday 13th precip

2 thoughts on “First loooong look at Christmas and Wet Sunday

  1. I’m going out on a limb and say Saturdays/Sundays rain is going to mostly slide to the south of us into Washington

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