18/07/2017 Weather for the Week Ahead


18/07/2017

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Hello. The week ahead is a story of ups and downs weather-wise.

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The temperatures at the moment are certainly on the up.

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Monday brought a lot of sunshine.

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A beautiful day for the beach

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on the Moray coast

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in north-east Scotland

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and also there in Cornwall.

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Notice, though, a bit of high cloud

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gathering in the sky.

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Just the first sign of some changes

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that are going to take place later in the week.

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As those temperatures continue to rise,

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the middle part of the week is likely to bring

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some quite vicious hit and miss thunderstorms.

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Once those clear away,

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the temperatures head downwards again.

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Some cooler, fresher conditions to take us towards the weekend.

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For the time being, though, high-pressure is in charge.

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As the high-pressure drifts a little bit further eastwards,

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it allows us to bring in this south-easterly airflow

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and that taps into some very, very warm air indeed

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across the near continent, some pretty humid air as well.

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So Tuesday will bring increasingly humid, muggy conditions

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and some more of that high cloud just

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streaming its way in across England and Wales.

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Having said that, there will still be a fair amount of sunshine

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although some thunder storms late in the day towards the south-west.

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An easterly breeze off the North Sea making it feel a little bit

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chilly along the east coast,

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but inland and further west,

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temperatures up into the high 20s in places.

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And with that heat and humidity, we will start to see some

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thunderstorms spreading in from the south during Tuesday night.

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They will be quite hit and miss but if you catch a storm,

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it could give you a lot of rain in a short space of time.

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Frequent lightning, maybe some hail.

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Some of those storms continuing across Scotland during Wednesday.

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As it brightens up across England and Wales,

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there could be enough heat

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and humidity to drive some further thunderstorms here and there.

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But, by this stage,

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something fresher beginning to show its hand out west.

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Through Wednesday night, into Thursday,

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as this cold front sweeps its way eastwards,

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it will start to bring us fresher air from the Atlantic.

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So westerly winds across the country on Thursday.

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A bit of a humid start, perhaps, across the south-east.

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By the end of the day,

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those temperatures much lower for all of us.

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A lot of dry weather, but some showers up towards the north-west.

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As we head into Friday, it looks like an area of low pressure

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will drift in from the Atlantic.

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A band of rain with that.

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So a bit of uncertainty about the timing of this rain band,

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but there will be some spells of wet weather for many

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and even where the main band of rain has cleared away,

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there could be some further showers.

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But the temperatures are way down on where

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they have been - 15 to 21 degrees.

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Low pressure still dominant as we move into the start of the weekend.

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The low likely to be across northern Scotland.

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There will be some spells of sunshine, also some showery rain.

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These westerly winds continuing to bring us the fresh conditions -

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16 to 22 degrees.

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The areas of low pressure will be brought

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to our shores by the jet stream -

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the winds way above our heads that drive the weather

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systems around the world.

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But notice as we go through the weekend,

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it looks like we could see a change in the shape of the jet stream.

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It is likely to bend its way northwards. What does that mean?

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Well, it means an area of high pressure that

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sits down across the Azores,

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may well be able to nudge its way a little

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bit further north and east and have a bit more influence on our weather.

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But there is some uncertainty into next week just how far north

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and east this area of high pressure will exert its influence.

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And in northern parts of the country,

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there'll be a fairly unsettled flavour.

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Spells of rain, quite breezy.

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But further south,

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it should become mainly dry, pleasantly warm,

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but not as warm as it is at the moment.

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