16/03/2017 Weather for the Week Ahead


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16/03/2017

Detailed weather forecast.


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I know a lot of you like it

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when we talk about the jet stream in this broadcast.

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You might reconsider by the end of this.

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There's a lot of jet stream coming up,

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but hopefully it's worth it.

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I want to show you a picture

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from glorious sunshine

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across much of Wales and England

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during Wednesday, 18.8 Celsius in the sun

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at London's Kew Gardens,

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the highest temperature the UK's had so far this year.

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That 17 in Hawarden in north-east Wales

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the highest that Wales has seen so far this year

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and you might be surprised to see

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this big dome of mild air across the UK.

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Of course, the highest temperatures are realised

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when we get some sunshine

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and it's high pressure across the UK as well

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that's kept our weather pretty similar

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as we've been through the past few days.

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No great change.

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The jet stream is to the north of us

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at the moment, not severely impacting our weather,

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and if you are new to the jet stream,

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here are a few key facts about it.

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There's a ribbon or a stream of strong winds up to about 200mph

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high in the atmosphere, up to nine miles above us,

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and it's along the jet stream...

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Well, it impacts and influences weather systems and steers them,

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particularly across the Atlantic towards us.

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We haven't been getting anything

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because the jet stream has been to the north of us

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and it's a looping,

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we call this meridional jet stream

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across the Atlantic right now

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and when you see that,

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you know the weather isn't changing very quickly.

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Weather systems, either high pressure

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or low pressure, stick around for some time,

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but fast forward to Friday and, look,

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these weather systems are queuing up

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right across the Atlantic to come into the UK

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on a jet stream which is no longer

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looping up and down,

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but it is taking a more direct

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straight line towards us.

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It is a zonal jet stream -

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it is stronger and on it,

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there are more active weather systems

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and they're coming right for us so, for Friday into the weekend,

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well, things will look and feel very different out there.

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Let's take things day by day.

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We will start with Thursday's weather

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and there is a band of rain

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pushing through Scotland and Northern Ireland,

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heavier for a time before clearing in the afternoon

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as sunny spells and scattered showers follow,

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some of that rain heading into

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northern and western England into Wales,

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the far south-east staying dry until after dark,

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not as much sunshine, not as warm

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and by Friday morning,

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it's quite chilly out there.

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Northern Scotland fares reasonably well

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on Friday, but for the rest of the UK,

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rain pushing south-eastwards,

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but then again, you might want something on your garden

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after it's been, for some of us, quite dry.

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And then this is the picture going into the weekend,

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I showed you it again a second ago.

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You can follow this weather system

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all the way back almost to North America

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and all of that is coming our way.

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It won't be raining all the time.

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I think some of the heaviest rain

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will be focused on western parts of the UK,

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into the hills and maybe Wales, for example,

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will see quite a lot coming down into the hills.

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Another spell of rain sweeping eastwards on Sunday,

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showers following on behind.

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Sunday looks like the windier of the two this weekend

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and it's in the wind, particularly,

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things are feeling cooler.

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Then into the start of next week,

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still low pressure close by

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so it's still looking unsettled.

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Another push of cooler air

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looks like it will come in,

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but as we get to the jet stream,

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look at this.

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It's no longer right across the Atlantic

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towards us, it's doing that looping thing again

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so it looks like the mobility is slowing down

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so pressure systems hang around longer.

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Low pressure at the start of the week,

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but looks like later in the week,

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there'll be a gradual progression to high pressure

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coming back into the UK

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and the influence of that will be

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to settle things down for many of us,

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turn things drier once again.

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It could be pleasant by day,

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but there is a risk of some cold frost overnight.

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So, a weather pattern at the end of next week

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pretty similar to what we have at the moment,

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in between something much more changeable,

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for which, of course,

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we can blame the jet stream.

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The psychiatrist was a figment of his imagination.

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