Mon. Sep 16th, 2019

The sun is great… but 5 weeks?

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

    Forecast Issued 11:00 AM PDT Monday 16 September 2019 - Monday: Mainly cloudy with 30 percent chance of showers. High 17. UV index 4 or moderate. Monday night: Cloudy. 30 percent chance of showers this evening. Rain beginning near midnight. Low 12. Tuesday: Rain ending in the morning then cloudy with 30 percent chance of showers. High 16. UV index 2 or low. Tuesday night: Cloudy with 70 percent chance of showers. Low 11. Wednesday: A mix of sun and cloud. High 21. Wednesday night: Cloudy periods. Low 9. Thursday: A mix of sun and cloud. High 19. Thursday night: Cloudy with 30 percent chance of showers. Low 12. Friday: Cloudy. High 22. Friday night: Cloudy periods. Low 12. Saturday: A mix of sun and cloud. High 19. Saturday night: Cloudy with 60 percent chance of showers. Low 12. Sunday: Cloudy. High 18.

  • Current Conditions
    Temperature
    18.1° C
    -0.1 ° C/hr
    Barometer
    100.77 kPa
    0.0
    Wind
    S 11 km/h
    gusting 23 km/h
    Humidity
    66 %
    Rain Rate
    0.0 mm/hr
    Wind Chill
    18.1° C
    Heat Index
    18.1° C
    Dewpoint
    11.7° C
    UV
    1.6
    Solar
    195 W/m2
    Last Updated: 15:40:00 PDT
    Click to Refresh or See All Conditions
  • Today's Almanac
    Rain since Midnight
    0.0 mm
    Continuous Rainfall (< 24hr gap)
    30.2 mm since
    September 12, 2019 00:09
    Civil Rise
    06:23
    Moon Phase
    Waning gibbous (93% full)
    Civil Set
    20:03
    Day Length
    13:14:01
    Day High
    19.2° C @ 13:09 Tdy.
    Day Low
    9.6° C @ 02:35 Tdy.
    Day High Rain Rate
    0.0mm/hr00:00
    Day High Barometer
    100.98 kPa @ 09:13 Tdy.
    Day Low Barometer
    100.77 kPa @ 00:00 Tdy.
    Day Low Windchill
    9.6° C @ 02:35 Tdy.
    Day High Heat Index
    19.2° C @ 13:09 Tdy.
    Day High Wind Gust
    S 13km/h @ 15:35 Tdy.
    Day High Solar Radiation
    958W/m2 @ 12:22 Tdy.
    Day High UV Index
    4.9 @ 13:32 Tdy.

This weather has been stupendous. Amazing. Incredible.

But I admit to being a little sceptical and a little worried.

As you can see here, in July and August we have had only 6 days below 25C.

But that doesn’t really tell the story. How can we have so much perfectly sunny weather over such a long period of time. My theory is it is down to a weak and nearly non existent Jetstream.

San Francisco State University has archived Jetstream analyses going back to 2010.

I have put together the animations for July/August 2010 and July/August 2013. This is a combination of satellite imagery and jetstream analysis (in yellow). You should notice that 2010 has a lot more yellow streaming over and around us, where as in 2013 it is broken up and infrequent.

What I believe it shows is the jetstream in 2010 (which was somewhat cooler but much more variable than 2013) featured a straighter, more consistently present jet stream. Whereas 2013 has featured a kinked, and almost non-existent jet stream. This is only one years comparison of course. So we should take this with a big grain of salt.

That’s my theory. I’m sticking with it for now. 🙂 We’ll see what August will hold. For now, it doesn’t look like it’s going to be much different. It sure would be nice to get a little rain.

5 thoughts on “The sun is great… but 5 weeks?

  1. I would like sun at least six days out of seven with rain falling between the hours of midnight and four, gently, every other day. Not happening? Well, I could make like all the media weather types and moan and complain, or take responsibility for it, or not, or tell my viewers/listeners that “I” am keeping a cloud or two in MY forecast. Too much emotional content where none belongs! I like the maps and explanations here. Keep it up.

  2. Good theory Chris, I’ll go with that! But WHY is the jet stream weak this summer, inquiring minds want to know?

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