UK storm warning due to Scandinavian high pressure system of rain and winds

The heavens are set to open today (November 21) as a relentless deluge of rain sweeps across the UK.

It will be the consequence of volatile weather fronts from the Atlantic bumping into high-pressure buildings over the Scandinavian countries of Sweden and Norway.

And the risk of flooding will again be ever present, as Jim Dale, meteorologist for British Weather Services, explained.

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He said: "There is a blocking high-pressure system over Scandinavia, and this will bring slow-moving frontal systems across Britain. These fronts will bump against the high which will stop them moving through quickly, leading to another week of wet weather.

"This situation of slow-moving frontal systems can bring a lot of rain in a short time, and this can spell flood danger, and while there may be some wind, the rain is going to be the main issue."

Unsettled weather will be driven by a powerful jet stream which has swerved south across Britain acting like a conveyor belt for storms.

The jet stream, a fast-flowing ribbon of air high in the atmosphere, forms a channel between polar air over the Arctic and milder air to the south.

Between the two air masses lies the polar front, which has followed the southwards path of the jet stream over Britain to drive the cold weekend weather.

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Mr Dale, author of Weather Or Not?, said: "The polar front has moved southwards and brought polar air over the UK, hence the lower weekend temperatures.

"The jet stream has also come southwards, and this will help to steer unsettled weather systems into Britain. I do not see any change from the wet weather we had last week and, while it will be windy, this will probably be localised."

The raging jet stream will power a "breeding ground" for choppy weather systems, forecast the Met Office.

However, as the polar vortex shifts next week it will bring milder air in from the south causing temperatures to rise.

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