09/03/2018 Weather for the Week Ahead


09/03/2018

Detailed weather forecast.


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Hello. We talk a lot on Weather for the Week Ahead about the jet stream

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because it is crucial in driving weather systems around the world.

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The winds high up in the atmosphere steering areas of low pressure

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but also dividing warm air from cold.

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Recently the jet stream has been to the south of the UK,

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keeping us in the cold air.

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But watch what happens as we head towards the weekend,

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the jet stream will slide northwards and that will allow us

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to bring in some milder air from the south.

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In fact, through the weekend, some pretty high temperatures.

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Some spots may be 15 or 16.

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But with that in close proximity to the jet stream there will be

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areas of low pressure so we'll see some outbreaks of rain.

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And there's some rain to come in places during Friday,

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spreading across the Channel Islands into southern parts of England,

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perhaps south Wales through the afternoon.

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To the north of that after a cold,

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frosty start with some mist patches it will turn into a mainly

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dry day with spells of sunshine,

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some showers into the north-west of Scotland and temperatures of 8-11.

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This area of low pressure developed by the jet stream will be

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spinning around to the south-west of Britain on Saturday.

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Frontal systems pushing forwards but follow the isobars,

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a southerly flow so that's where the mild air will be coming from.

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During Saturday we'll push this area of rain out of northern England

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and Northern Ireland into Scotland where it could well give some

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snow over the hills.

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At low levels it will mostly be rain

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because all the while we will be bringing this milder air

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up from the south and I think Saturday is the day,

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given a bit of brightness in the south-east

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corner we could get to 15 or 16.

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Sunday is likely to start off with some mist and fog patches.

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A lot of low cloud as well.

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Things should brighten up for many with some spells of sunshine.

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Showers likely to be spreading across the southern

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half of the country.

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Some of these heavy. Still pretty mild, even in Edinburgh up to 10.

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A high of 14 in London.

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Low pressure remains the dominant feature as we move

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into the start of the new week.

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In fact there could be three different low pressure

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centres at this stage.

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A lot of uncertainty about exactly where each

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area of unsettled weather will move

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but there will be some outbreaks of rain at times.

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Potentially still some snow over high ground in the north

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but generally it will be rain

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because we're going to stick with that slightly milder feel.

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8 degrees in Aberdeen, 12 in London.

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Looking ahead to Tuesday it may well be that an area of high

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pressure starts to build in from the south temporarily

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so more in the way of dry weather.

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Could be some mist and fog patches first thing but Tuesday at this

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stage looks like a mainly fine day with some spells of sunshine.

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Still relatively mild, 9-11 or 12.

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As we move through the middle and latter part of next week we're going

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to see further areas of low pressure drifting in from the south-west.

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So it stays pretty unsettled.

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There will be some spells of rain at times.

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But I want to show you the jet stream for the end of next week

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because by this stage we're expecting it to have dived its

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way southwards once again

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and that leaves the potential for some colder air from the north.

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Particularly by the time we get into next weekend.

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It's by no means a done deal just yet

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but it looks like the end of next week will bring some

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rain at times, equally some spells of sunshine.

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Could be windy at times and just the potential that into next weekend

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things may turn a little colder and it's all because of the jet stream.

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We'll keep a close eye on that over the next few days.

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