The immediate cause of the problems is the behaviour of the jet stream, a band of high-level wind that travels east around the world and influences much of the weather below it.

引起这些问题的直接原因是急流[注1]的运动方式 ----在高空、绕地球向东流动并能给下面的天气造成很大影响的一股风。

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Up near the jet stream above New York, the wind power density can reach 16 kilowatts per square meter.

在纽约上空的射流层（对流层顶）附近，风能密度可达16千瓦每平方米。

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The calculated results show that the calculated diagnostic wind fields are more similar to climatology than the geostrophic wind fields, especially, in the jet stream area.

通过对结果的分析，发现用此方法得到的诊断风场比地转风场更接近实际，特别是急流区。

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In both instances, the Met Office failed to predict the movements of the jet stream - the high-level wind that races round the world 10km above the surface.

BBC: Met Office cools summer forecast