Interesting Jet Stream


There is an interesting ‘split’ in the Jet Stream today:

Jet Stream 29 April 2012

Jet Stream 29 April 2012

Recently it’s been a much more “Loopy” jet stream (as it does during times of cold phase PDO and / or low solar levels) with deeper Rossby Waves (rather like it was back in the ’60s).

Don’t really have much to say about it; just that it’s an interesting configuration. The last few months we had a cold West Coast and a very warm East Coast. That directly came from where the deep loops were located. Cold air in a deep down loop in the west, Caribbean tropical air being pulled north in a large upward moving loop.
Now that’s changed.

While I don’t know what happens with this kind of split (they don’t happen all that often and mostly impact areas away from me, so I’ve not noticed much) it ought to be interesting to watch. Perhaps bringing a bit of unusual or chaotic weather. The Weather Channel is reporting a lot of hail and some strong winds with storms in the middle of the nation.

One thing is clear, though: This has happened before. Both the deep Rossby Waves and the split jet stream. It is NOT in any way related to CO2 or to “global warming”. It’s just ordinary weather cycling. Very much like it was back in the ’60s and ’70s as near as I can tell. It reminds me of what I remember from the local weather reports then (the maps) and the weather events that I personally experienced and saw on the Nightly News.

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About E.M.Smith

A technical managerial sort interested in things from Stonehenge to computer science. My present "hot buttons' are the mythology of Climate Change and ancient metrology; but things change...
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6 Responses to Interesting Jet Stream

  1. adolfogiurfa says:

    Perhaps there is another field interfering. Venus and its beautiful tail will be crossing the US from 15:00 ET to 17:00 ET, entering above north Florida and going out over California.

  2. George says:

    It is a typical result of the AO (Arctic Oscillation) When it is one way, the jet is zonal, when it is the other way, the jet is “loopy”.

  3. Pascvaks says:

    Probably mistaken, but it’s a ‘mistake’ I’ve entertained for a while now. When climate cycles out of the warmest phase of the current interglacial (now;-) to colder patterns, so to speak, I expect that the Jet Stream patterns will be significantly changed with it. Not so ‘new’, but one would expect that the Ferrell Cells in the middle will be gradually squeezed nearly out of existance, if not entirely, and the Polar Cells will increase and encompass more and more territory. Perhaps it’s more of a squeezing of both the Ferrell Cells and the Hadley Cells, but the Jets have simply got to move to allow for the glacial ice growth. And, it seems to me as the Cells and Jets move toward the Equator in the Colder Hemisphere, they quickly impact the ‘warmer’ hemisphere and force cooling there too, so we don’t see a frozen one and a hot other, but both pretty much in sync and either cooling or warming together. This is chicken or egg stuff at my level, so I’m in the dark really, but it’s “jus’ gotta’ be the ocean that changes first”, right? Global Ocean Conveyor cools Jets shift? Not versa visa, right?

    This is like seperating chewing tobacco and bubble gum, ain’t it?

  4. Pascvaks says:

    Oversight on my part, here’s a NWS site with a pic that shows the cells and jets:

  5. tckev says:

    From memory (so I may be mistaken) I remember reading a paper from NASA (maybe?) about solar cycles modulating the expansion/contraction of our atmosphere and affecting how ‘loopy’ the jet stream gets. Bottom-line was that the solar cycle pretty much governs these upper atmospheric effects by some unknown mechanism.

    Sorry can’t find the links at the moment as I’m still setting up the old IBM Thinkpad with a new Linux OS and it’s a bit of a pain getting through my archived stuff.

  6. adolfogiurfa says:

    @Tkev: Not unknown:
    The stronger the earth´s magnetic field the closer to the pole (& vice versa)
    Birkeland reproduced this phenomenon in his “Terrela” experiment.
    Google for Birkeland Terrela

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