The snow signalled the arrival of a front, and a high-pressure area seemed to be settling in.

降雪标志了一个锋面的到来，一个高压区似乎正在进入本地。

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As the gas expands rapidly in the surrounding area, it creates a temporary vacuum in the middle which determines a high-pressure implosion.

当气体在周围迅速扩张的时候，中间区域就会出现暂时的真空，而这造成了高压力的内爆。

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The two events are linked by a large-scale pattern of atmospheric circulation which is producing a particularly persistent area of high pressure over Russia.

这两起事件与一种大规模的大气环流模式有关，该模式正在俄罗斯上空形成一片持续时间很久的高气压区。

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Usually, the prevailing south-westerly wind would take the ash cloud away from Europe and over the polar region, but a high-pressure area is bringing it over Europe, where it is sitting and barely moving as the ash spreads.

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According to Dr Elsner, this change is related to sudden shifts in the position of the long-term area of high pressure that sits near the Azores.

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With high pressure now established up from the southwest in the eastern North Atlantic - and an area of low pressure being held further west of Ireland - this year's festival continues on a settled and increasingly warm note.

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