21/04/2016 Weather for the Week Ahead


21/04/2016

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Hello. The cold weather that's going to arrive in the next few days

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will be a real shock to the system,

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especially when you consider what we've had

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over the past few days,

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with the warmest day of the year so far -

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19 degrees in west Wales.

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Not as much sunshine on Thursday.

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Cloud continues to spill up from the southwest,

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not too threatening just yet.

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Eventually, it will bring some rain.

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A few spots of rain in the north of Scotland.

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The sunniest skies will be for Northern Ireland

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and northern England.

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Not as sunny in the south as it was on Wednesday.

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There's still some warmth out there,

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but compare that with Friday -

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temperatures really taking a tumble,

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by as much as 6 degrees in the case of Newcastle and Birmingham.

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Two reasons for that -

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that thickening cloud, this time bringing rain

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into the south-west,

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possibly pushing into the south-east,

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the Midlands and Wales.

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To the north there'll be sunshine,

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but the wind direction is changing here

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and we're dragging down northerly winds.

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The big change, because high pressure

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that is right now over the UK,

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by Friday will be out in the Atlantic

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and as it sits over there,

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it means we will draw down these northerly winds.

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By the time we get into the weekend

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they may bring down air from the Arctic.

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It is going to feel colder this weekend,

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particularly in the stronger winds

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down the eastern side of the UK,

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and this is where we'll find most of the showers.

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There could be hail, sleet and snow

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almost anywhere because the air will be that cold.

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As we head into Sunday,

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again the chance of showers,

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a few coming off the Irish Sea,

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but the bulk of the showers

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down the eastern side of England,

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where temperatures are struggling

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to make 7 or 8 degrees.

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And for the first time in the history of the London Marathon,

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there's the chance of some wintry showers.

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It's certainly going to feel cold

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and it could be quite blowy as well.

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Challenging conditions are ahead.

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Let's look at the bigger picture.

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This is where all our weather is coming from.

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You can follow the isobars from the north.

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Again, high pressure to the west of us,

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low pressure to the east,

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so that brings down the winds from the north.

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On Monday, there'll be sunshine and showers,

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those showers could be rather wintry.

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Maybe Monday not quite as cold

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in the south and west,

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but we'll find another surge

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of colder air into next week,

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those northerly winds bringing down

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the cold from the Arctic once again.

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And if we put on top of that

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the jet stream,

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we've got this pattern again.

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We looked at that yesterday.

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This is a pattern

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that is not really going to change.

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It's likely to be with us

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right the way through next week,

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so we'll stay in the colder air.

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Maximum temperatures at this time of year

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should be about 13, maybe 15 degrees.

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This is what we'll see

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throughout next week -

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a drop of some 2 to 4 degrees.

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This is likely to be the longest spell

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of below-average temperatures

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that we've had for an awful long time.

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Next week will feel cold

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in the northerly winds,

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there could be frost at night.

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Not too bad if you're in the sunshine

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but those showers are likely to be of a wintry flavour.

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Perhaps the beginning of May

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sees temperatures rising back to normal.

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