25/08/2017 Weather for the Week Ahead


25/08/2017

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Hello there. Our weather is stuck in something of a rut at the moment.

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The winds are very light,

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there's nothing to push things along,

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nothing to change things very quickly,

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and a lot of that is down to the jet stream.

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Instead of steering weather systems

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across the Atlantic, towards our shores,

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the jet is diving down to the south.

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All the strength, all the energy

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in the jet is going down to the south,

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and that means areas of low pressure

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will spin around close to Iberia.

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What we're left with is a very

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weak pressure pattern, really -

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not many isobars, the winds will be light,

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low pressure vaguely in charge

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to the north-west, so that means here,

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we'll see some rain at times.

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Not all the time, and it will be fairly cool.

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High-pressure vaguely in charge

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down to the south-east,

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so that means it will be largely dry,

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pleasantly warm in any sunshine

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and I suspect some parts

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of the south-east may stay completely dry

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as we go on through the coming days.

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On Friday, there will be a fair amount

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of sunshine for East Anglia and the south-east.

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Bit more cloud for Wales

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and northern England, the odd shower,

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some showers for Northern Ireland.

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Again, some rain here on Friday

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and some of those showers into Scotland.

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Now, as we go on through Friday night,

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while showery rain continues

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across Northern Ireland for a time,

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it should eventually dry up a little bit here.

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Showery rain continues across Scotland.

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Further south, largely dry -

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the odd fog patch and maybe beginning

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to turn a bit humid down towards the south-east.

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Now, one subtle change on Saturday -

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this frontal system sinking its way

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a little bit further south.

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That will introduce perhaps a little more cloud

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for England and Wales, and there may just be

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the odd isolated shower here,

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but the vast majority here will stay dry.

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Still some showers for

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Northern Ireland and Scotland,

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maybe not quite as many showers by this stage,

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but some of them could still be on the heavy side.

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Quite a range of temperatures -

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17 degrees there in Glasgow,

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but 20 in Cardiff,

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and we could get to 25 in London.

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Now, Sunday will actually bring

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a fair amount of dry weather

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right across the country.

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Still some showers in the far north-west.

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Perhaps an isolated heavy shower further south,

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just a small chance of that, I suspect,

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17 to 24 degrees.

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But this if we look at the pressure pattern

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as we head on into Monday,

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a bank holiday for many places, of course,

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you can see things becoming a little more mobile.

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The white lines squashing together

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a bit more, that means there will be more

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of a breeze and this band of rain,

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heavy rain in the north-west,

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sinking its way southwards and eastwards,

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but weakening as it goes and, yes, you guessed it -

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parts of the south-east

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will stay completely dry during Monday.

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Now, through Monday night, our weather front

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sinks southwards and eastwards,

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but it's weakening all the while,

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so not much rain into the south-east.

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Maybe just some patches on Tuesday morning.

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Then a bit of a drier interlude,

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but we have a westerly wind -

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never a warm wind direction, so temperatures

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14 to 21 degrees at best.

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Now, as we get deeper into the week,

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our jet stream, instead of diving

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way down to the south,

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is making more of a beeline

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for the British Isles.

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That means weather systems will

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move in our direction and,

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on the face of it, it makes things

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look a little bit more changeable.

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However, low pressure is likely

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to sit to the north.

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Generally, we'll have a westerly wind,

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and what that means is, once again,

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the wettest of the weather will be

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up towards the north-west.

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Bands of rain or showers moving in,

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then as they move southwards and eastwards,

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remember, we move away from

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that area of low pressure,

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the rain will tend to weaken

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and we also have some shelter

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from that westerly wind, so eastern areas

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will see a lot of dry weather.

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Later next week, then, the pattern continues -

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the wettest weather will be in the north-west,

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it'll always stayed drier towards the south-east

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and no heatwave on the cards.

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Generally quite cool,

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so not too much changing over the next few days.

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