The jetstream weather system that dictates much of our weather may be changing, according to new research.

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Studies suggest the high-speed air current is taking a longer and more meandering path, meaning that weather across northern Europe and North America has remained the same for prolonged periods.

The jetstream’s path could account for stormy weather remaining over the UK longer than expected, and the sub-zero temperatures seen across the midwest of the US.

Scientists presenting the research at a meeting of the Association for the Advancement of Science believe it may be due to rising Arctic temperatures, which reduces the temperature differential between the Arctic and lower latitudes – and therefore the jetstream’s power – meaning it can be diverted by other areas of high pressure.

In the shorter term, the next few weeks are likely to see cold air from Canada strengthening the jet stream – shown in the graphic above from Weatherquest – leading to further spells of low pressure and unsettled weather, though the centre of the lows, and therefore the most extreme weather, is likely to fall over north-west England.

1 comment

  • I dont believe so. Even some of the experts say this is a normal shift in the jet stream. The weather outlook web site was saying last year that we could see a shift back to extended periods of blocked weather-the same sort of blocking patterns that produced droughts in the 70s and the winters of 1947 and 1963-rather than weather systems racing though and shifting from one influence to another after a short time. What sort of weather will be produced by the position of the jet stream is another matter-I think we were lucky to avoid a very cold winter, and unlucky to cop storms at the same time as spring tides at the start of winter. AGW alarmists should look a little further back at precedents for extended periods of weather, fine and bad int he past, because it seems they are there ( David Booty's web site)

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    Daisy Roots

    Monday, February 17, 2014

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