08/08/2017 Weather for the Week Ahead


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08/08/2017

Detailed weather forecast.


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We're going to take a look at the weather prospects

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for the whole of the British Isles for the next few days

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in just a second, but first of all

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I just want to bring you right up to date with where we are

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with regard to the heat across the southern parts of Europe

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because Monday saw very little change in the overall pattern.

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Many of the temperatures that I'm showing you here are still

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some 5-7 or 8 degrees above what we would expect at the time of year,

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and part of the reason that that heat wave has been

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so persistent is that the jet stream hasn't been able to

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bring in from the Atlantic cooler, fresher conditions.

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Whenever you get to see that sort of dip in the jet stream,

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you can very comfortably, at the surface, rather than in

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the upper atmosphere, fit in quite a vigorous area of low pressure.

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And there it sits close by on the near continent.

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And we'll certainly see some of the effects of that particular system

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in the south-eastern quarter as the day goes on.

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Some really quite heavy pulses of rain in there,

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maybe the odd rumble of thunder, and Monday's weather front,

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which we thought was just going to peter out

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across the southern counties, will gradually be pushed

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ever further north across the greater part of England and Wales,

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cloud and rain here putting a bit of a dampener on things

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and a dent in the temperatures, too.

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The best of the conditions perhaps Scotland and Northern Ireland.

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Now, that area of low pressure is on the move and rather unusually,

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it moves from south to north during the course of Wednesday.

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But it leaves behind a legacy of a trailing

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and really quite active weather front, so again some heavy

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pulses of rain here through East Anglia and the south-east.

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The best of the conditions - Scotland, Northern Ireland,

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northern and western parts of both England and Wales.

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And for that, you have to thank this area of high pressure

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trying to be the dominant feature on Thursday,

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but you'll notice it's sandwiched in between those areas of low pressure,

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so it's a bit of a battle.

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We have to get rid of that rain first of all before it

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brightens up in the east and then cherish the rest of Thursday,

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because, as I say, it's a battle

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which I'm afraid that area of high pressure loses out to

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this new area of low pressure up by Iceland. Its trailing weather front,

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and quite compacted isobars too, bring a combination of wet and windy

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weather initially into Scotland and Northern Ireland and then

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gradually pushing it ever further south during the course of Friday.

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And those temperatures really nothing to write home about at all.

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And the breeze will be quite a considerable factor

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on the day as well.

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Even as I take you out of Friday on into Saturday, we still have

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weather fronts associated with that low

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draped down across the British Isles.

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Not a write-off, not a really messy start to the weekend -

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it will be a mixture again of sunny spells and showers,

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the breeze rather noticeable there across the greater part of Scotland.

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Similar sort of fare on into Sunday

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and as we take you into the start of the new week,

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we've got essentially low pressure north of the jet stream,

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high pressure to the south of the jet stream,

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and that enables us to stay in this flow of west to south-westerly winds

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right across the British Isles,

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giving us what we call a mobile pattern of weather.

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So, the high pressure, not a million miles away

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from the south - it's not all doom and gloom,

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but it's not doing enough to keep the low pressures closer to Iceland

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from the northern half of the British Isles

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and at times we will have these spells of wet and windy weather

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moving on across particularly the northern half of the country.

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So, the driest of the conditions, thanks to that area

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of high pressure, will be found in the south,

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while the wetter and windier conditions

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will be found in the north,

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and I'm afraid for a heat wave you'll have to move down

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towards the southern parts of Europe. Bye-bye.

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