30/09/2014 Weather for the Week Ahead


30/09/2014

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Hello. We're anticipating some significant changes

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with the weather patterns as we go through weekend

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and the early part of next week.

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More on that in just a moment.

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First of all, there's one more day of September left,

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which has been a very dry month, and a pretty warm month, too.

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And there'll be more fine weather across the bulk of the UK

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during Tuesday. In the West, though,

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there is a weather front making for a damp day for Northern Ireland,

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and outbreaks of rain slowly trickling across Western Scotland.

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The Western Isles may brighten up late in the day,

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and we won't see too much rain - generally dry and bright

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across the far Northeast,

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but a damp evening rush hour for Glasgow.

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Dull and damp for most of the day in Northern Ireland,

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but, particularly in the West,

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it might brighten up a little in the afternoon,

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as that rain trickles across the Irish Sea

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towards Cumbria and Lancashire.

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For the bulk of England, though, it's a fine day.

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Could start a bit misty,

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small chance of a shower in the Southeast,

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but in the sunny spells it'll be warm again with highs of 21.

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That rain, though, does trickle into Devon, Cornwall and Wales

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through the late afternoon,

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and the outbreaks of rain become more extensive

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across England and Wales during the night.

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Another weather front will bring rain back to the Northwest

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through the night as well. It's not going to be a cold night -

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again, Tuesday night sees temperatures staying in the teens

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in most towns and cities.

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Into Wednesday, then,

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we've got a couple of weather fronts pushing slowly Southwards -

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one bringing patchy rain and drizzle across Southern areas,

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one clearing away from Scotland and Northern Ireland,

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actually, here, for the bulk of the day,

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there'll be spells of sunshine.

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That rain slowly edging into Northern England and North Wales.

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Between those two weather systems, a bit of brightness,

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still quite mild in the South, 20 degrees.

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Despite some sunshine, a fresher feel further North.

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High pressure is still the dominant feature

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through Wednesday night,

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getting rid of those weather fronts, but areas of low pressure

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are starting to gather out in the Atlantic.

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That will eventually bring some rain into the far Northwest

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late on Thursday, but, for most, high pressure still with us on Thursday.

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Another dry day.

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Cold start across Northern Britain.

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By the afternoon, temperatures back in the mid teens, or perhaps,

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in the South, up to 20 Celsius.

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Now, the more significant changes start to happen on Friday

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and Saturday - an active weather front driving South is bringing

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some heavy rain, and the isobars are really pinching together,

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so the wind's starting to pick up, too.

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A wet and a windy day for parts of Scotland,

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Northern Ireland, Northern England and Wales.

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That rain may linger in some places and could cause a few problems.

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Further South, still dry and still mild at this stage,

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but the weather front will drive across all areas

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as we go into the weekend, it looks like.

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So, a spell of heavy rain for all of us,

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and also, as that weather front moves through, it's a cold front,

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so much fresher conditions following on behind.

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Blustery, with some sunshine.

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So, a change of type of our weather as we go through the weekend.

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Why the change?

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Well, it's all to do with the jet stream -

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that fast-moving ribbon of air high up in the atmosphere.

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For most of September,

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the jet stream has been to the North of the UK,

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and it's the jet stream that drives areas of low pressure.

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So, mostly, through September, the low pressure systems,

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which bring the wind and the rain, have been to the North of the UK.

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But next week the jet stream is driving South across the UK,

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which means the low pressure systems will follow,

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and they'll be spreading wind and spells of rain across the UK.

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So, scenes like this will become more familiar.

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Yes, you will need your umbrellas again -

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the leaves will start to come off the trees more rapidly,

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because we will see those changes.

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It'll feel fresher, as well -

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temperatures will still be around average,

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but because we've been above average for so long,

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it will feel cooler, and there'll be spells of wind and rain.

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And we'll continue to bring you the details

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here and online.

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'Two minutes left, bakers!'

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I think I've overdone it with the pistachios

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and somehow, the custard's split, but it's too late!

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Paul told me not to under-bake it.

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He's going to have a field day!

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Ian's representation of the evils

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