20/12/2016 Weather for the Week Ahead


20/12/2016

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The weather is about to turn pretty wild as we enter

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the stormiest period of the winter so far.

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It has been so quiet lately, but I think a bit of a shock on the way.

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Very strong winds, potentially, on the way and some heavy rain too.

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Maybe even a little bit of snow, but not an awful lot.

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Mostly across the hills.

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Let's have a look at the reason for this stormy weather.

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It is the jet stream roaring out of North America

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making a beeline for the UK.

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Underneath this jet stream what we get is

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areas of low pressure spin up.

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There is one low pressure here.

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This is around about Christmas Eve time.

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There is a bit of a lull and then this next one

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will be heading our way as well.

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It is too early to say exactly how big these lows will be,

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how strong the wind will be

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and where the worst of the weather will occur.

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Probably north-western areas,

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but that is still a little bit too far off.

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In the short term, this is what we have got Tuesday morning.

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Mild, damp, cloudy weather in the south.

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A touch of frost across these northern areas.

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The morning certainly nippy across Scotland and Northern Ireland.

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Temperatures in many areas around freezing,

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a little bit milder in the Western Isles.

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That is a hint of things to come.

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And then to the south of that across England and Wales,

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it is still pretty cloudy.

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The difference with Tuesday compared to Wednesday will be that

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on Tuesday we are going to see some of that cloud breaking up,

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so there will be some sunshine eventually coming through.

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The morning will be grey and drizzly but then things will improve

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a little bit. Look at the number of isobars here. That means no wind.

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Look at the number of isobars there.

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That is the screaming gale-force wind coming out of

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the Atlantic Ocean and it is going to be pushing the first

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weather front through during the course of Tuesday evening through

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Northern Ireland and Western Scotland and then by the time

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we get to the middle part of the week,

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these weather fronts well and truly rushing through the UK.

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Winds increasing pretty much everywhere, gales around

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these north-western coasts, perhaps further west and south too.

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But I think initially,

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the weather not too blustery across the far south here.

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I think it will still be probably cloudy and damp at times.

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A lot of sunshine around too, it is not all bad.

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There will be blustery cold showers around.

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I think by the time we get to Thursday, Friday and through

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the weekend, through Christmas that is when things turn interesting.

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Let's have a look at the scene across our part of the world

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as we enter Christmas Eve.

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Here is that nasty area of low pressure with very strong

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winds blowing around it.

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There are tonnes of isobars there.

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You can't really count them. They just go on and on.

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Here are the gale-force winds.

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The worst of the winds at this stage probably on Christmas Eve

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somewhere around the north, north-west of the country.

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Then a bit of a lull and then Christmas Day we'll see heavy rain

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sweeping across the country and another area of low pressure.

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This one could jog a little bit further south,

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it might be a little bit further north so the details are uncertain.

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But what is interesting is that between these areas of low

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pressure because the winds spin around like so,

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the back edges of the low pressure could see some cold air coming in.

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So we might even have some hill snow particularly across northern areas.

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So, yes, during the course of Christmas Day into Boxing Day

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and beyond there is a possibility of some wintry, sleety weather

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across northern areas of the UK.

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But be prepared for disruptive winds potentially and some heavy rain

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throughout this Christmas period.

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Well worth checking the forecast regularly. Thanks for watching.

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