22/12/2017 Weather for the Week Ahead


22/12/2017

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Hello. After Christmas Day, it looks like the weather pattern is going

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to be much more changeable, very unsettled conditions to come.

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In the run-up to Christmas Day, things are very quiet.

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We are keeping the cold air at bay for the time being.

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Mild conditions across the UK

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because the jet stream is in this position,

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so it is to the north of us,

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so we are on the warmer, milder side of that.

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But that mild air comes with a lot of cloud.

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Essentially, we've got this flow of westerly winds with

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high pressure to the south, low pressure to the north of us

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and on those weather fronts, as they get closer to the UK,

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we'll see some spells of rain.

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After a dull and damp start on Friday,

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many areas will become drier.

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We may get some drizzle across the Highlands of Scotland

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as cloud comes in here.

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Best chance of seeing some sunshine

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probably in the north-east of Scotland.

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But under the cloud, and there will be a lot of it

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and there may be some hill fog too,

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the temperatures could be 10 to 12 degrees.

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And not really falling very much overnight.

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We've got the strong winds coming in across the more northern

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parts of the UK.

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That rain beginning to develop a little more widely

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across the Highlands and up towards the Northern Isles too.

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A lot more cloud across eastern areas of Scotland,

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so temperatures here won't be quite as low.

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Elsewhere with cloudy skies,

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a mild night - 8 or 9 degrees.

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We still have this same weather pattern then,

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high pressure to the south of us dominating.

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Lower pressure to the north.

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Run of Atlantic winds

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and on that weather system we are going to find some more rain.

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So this is Saturday, the start of the weekend.

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We've got those winds continuing to

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strengthen across the northern half of the UK.

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More rain coming into the north-west of Scotland,

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maybe where we've got some shelter from the hills,

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we may see a little sunshine coming through.

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But on the whole, it remains cloudy, it remains dry, quite misty

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and murky over some of the western hills.

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Very mild. Temperatures again 10 to 12 degrees.

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Christmas Eve now, and things starting to turn

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wetter across Scotland, particularly Western Scotland.

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The rain adding up more and more

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and some rain coming into Northern Ireland.

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Some drizzle over some western hills but otherwise a mild and cloudy day.

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We've got low-pressure developing along that weather front

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which is going to start to change things

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Christmas Day and beyond.

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So it is buckling our band of wet weather,

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pushing it back northwards again across Scotland

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where there's still some colder air over the Highlands

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and Grampians where there could be some snow.

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Otherwise, heavy rain in Scotland coming into Northern Ireland.

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England and Wales, windy but very mild and cloudy.

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Temperatures 10 or 11 degrees.

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That's the last of the really mild air, though.

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I think as we head into Boxing Day,

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temperatures will drop a little bit,

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particularly across Scotland and Northern Ireland as we get

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some colder but drier air moving down into England and Wales.

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But the really cold air is across the other

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side of the Atlantic into North America.

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This colder air is going to drive its way across the Atlantic

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towards the UK from time to time beyond Christmas.

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So this is after Christmas Day and we're getting a strengthening

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jet propagating right the way across the Atlantic.

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It squishes away the high pressure and instead of high pressure,

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we're probably going to pick up areas of low pressure and drive them

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towards the UK just like this.

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Lots of isobars on the chart. It will be wet, it will be windy.

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Still this colder air tucking in across northern areas

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of the UK from time to time,

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so there is the threat of some snow

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across the North where we get these colder spells.

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But on the whole, very unsettled weather, rain could be quite heavy

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at times and it will be accompanied by some strong to gale-force winds.

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So very different weather from what we're seeing at the moment.

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That's it, goodbye.

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