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Jet Stream Changes Forecast

February 26, 2014

By Paul Homewood





Readers will no doubt remember that, just a couple of weeks ago, a certain Julia Slingo was explaining with regard to recent wet weather that

All the evidence suggests there is a link to climate change”.


Her logic was that the position of the jet stream, that had brought all the bad weather, was linked to the Arctic plunge in the USA, which in turn was linked to some rain in Indonesia.


Well, it appears that her little theory has not lasted long. The BBC tell us that, this week, the jet stream will start to reorientate itself, thus removing the high pressure block, that has brought the Arctic air so far south.

One positive benefit from this is that it will hopefully bring plenty of rain to California.

As far as the UK is concerned, it looks likely that the jet stream will slow down and resume more of a usual position further north by next week.

So it turns out it was just weather after all.







  1. Bill Illis permalink
    February 27, 2014 1:10 am

    Significant rain forecast in the next few days for California in the GFS forecast and it continues after that.

  2. February 27, 2014 1:42 am

    ”Jet stream” is COLD / DRY air from Arctic puled south by the earth’s centrifugal force – on the way south collects moisture and dumps it somewhere – that always happened and always will, it’s the change of weather. If the temp stops changing on different places – the winds would stop – there was always wind and always will be

  3. Jack Richardson permalink
    February 27, 2014 2:34 am

    Or perhaps Arctic amplification given the extreme warming in the Arctic.

  4. John F. Hultquist permalink
    February 27, 2014 6:05 pm

    February 27, 2014 1:42 am
    “Jet stream” is COLD / DRY air from Arctic puled south by the earth’s centrifugal force . . .

    The “jet streams” are much more complex than this statement suggests. For example, Earth does not have a “centrifugal force” although this term is often used in the context of Earth rotation. Such rotation is said to produce a Coriolis effect that in the Northern Hemisphere brings about the right-hand or clockwise deflection of air, water, and artillery shells. Issues are explained in the link below;

    If nothing else were going on the flows in the atmosphere would just go in circles. But one of the other things going on is conservation of angular momentum. Here is a link to a slide presentation on that from San Jose State University:

    Addition ideas here:

  5. Andy DC permalink
    February 27, 2014 11:36 pm

    There is still going to be plenty of cold air flooding the US into next week. One of those Pacific storms coming inland is supposed to interact with that cold air and cause a major snowstorm for much of the Midwest and eastern US early next week.

  6. February 28, 2014 12:42 am

    John F. Hultquist said: ” Earth does not have a “centrifugal force”

    WRONG John, wrong! If the earth stopped spinning – around Indonesia the sea would have dropped by 7m – by similar amount the water in Arctic and around Antarctica would have risen!!!

    2] for 7-8 months in a year the earth’s centrifugal force is bringing from Antarctic those dry / cold ”HIGH”s – they go occasionally north right to Port Moresby / New Guinea

    3] NASA is using the ”centrifugal force” of other planets; to speed up a satellite (even though they WRONGLY refer to it as: planet’s ”gravitational force” Cheers!!!

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