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New research suggests that the main system that helps determine the weather over Northern Europe and North America may be changing.
The study shows that the so-called jet stream has increasingly taken a longer, meandering path.
This has resulted in weather remaining the same for more prolonged periods.
According to Prof Jennifer Francis of Rutgers University in New Jersey: "This does seem to suggest that weather patterns are changing and people are noticing that the weather in their area is not what it used to be."
The meandering jet stream has accounted for the recent stormy weather over the UK and the bitter winter weather in the US Mid-West remaining longer than it otherwise would have.
"We can expect more of the same and we can expect it to happen more frequently," says Prof Francis
This results in weather patterns tending to become stuck over areas for weeks on end.