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I know a lot of you like it | 0:00:03 | 0:00:04 | |
when we talk about the jet stream in this broadcast. | 0:00:04 | 0:00:06 | |
You might reconsider by the end of this. | 0:00:06 | 0:00:08 | |
There's a lot of jet stream coming up, | 0:00:08 | 0:00:09 | |
but hopefully it's worth it. | 0:00:09 | 0:00:10 | |
I want to show you a picture | 0:00:10 | 0:00:12 | |
from glorious sunshine | 0:00:12 | 0:00:13 | |
across much of Wales and England | 0:00:13 | 0:00:14 | |
during Wednesday, 18.8 Celsius in the sun | 0:00:14 | 0:00:17 | |
at London's Kew Gardens, | 0:00:17 | 0:00:19 | |
the highest temperature the UK's had so far this year. | 0:00:19 | 0:00:21 | |
That 17 in Hawarden in north-east Wales | 0:00:21 | 0:00:23 | |
the highest that Wales has seen so far this year | 0:00:23 | 0:00:25 | |
and you might be surprised to see | 0:00:25 | 0:00:27 | |
this big dome of mild air across the UK. | 0:00:27 | 0:00:29 | |
Of course, the highest temperatures are realised | 0:00:29 | 0:00:31 | |
when we get some sunshine | 0:00:31 | 0:00:32 | |
and it's high pressure across the UK as well | 0:00:32 | 0:00:35 | |
that's kept our weather pretty similar | 0:00:35 | 0:00:37 | |
as we've been through the past few days. | 0:00:37 | 0:00:38 | |
No great change. | 0:00:38 | 0:00:40 | |
The jet stream is to the north of us | 0:00:40 | 0:00:42 | |
at the moment, not severely impacting our weather, | 0:00:42 | 0:00:45 | |
and if you are new to the jet stream, | 0:00:45 | 0:00:47 | |
here are a few key facts about it. | 0:00:47 | 0:00:48 | |
There's a ribbon or a stream of strong winds up to about 200mph | 0:00:48 | 0:00:53 | |
high in the atmosphere, up to nine miles above us, | 0:00:53 | 0:00:56 | |
and it's along the jet stream... | 0:00:56 | 0:00:58 | |
Well, it impacts and influences weather systems and steers them, | 0:00:58 | 0:01:01 | |
particularly across the Atlantic towards us. | 0:01:01 | 0:01:04 | |
We haven't been getting anything | 0:01:04 | 0:01:05 | |
because the jet stream has been to the north of us | 0:01:05 | 0:01:07 | |
and it's a looping, | 0:01:07 | 0:01:08 | |
we call this meridional jet stream | 0:01:08 | 0:01:11 | |
across the Atlantic right now | 0:01:11 | 0:01:12 | |
and when you see that, | 0:01:12 | 0:01:14 | |
you know the weather isn't changing very quickly. | 0:01:14 | 0:01:16 | |
Weather systems, either high pressure | 0:01:16 | 0:01:17 | |
or low pressure, stick around for some time, | 0:01:17 | 0:01:19 | |
but fast forward to Friday and, look, | 0:01:19 | 0:01:22 | |
these weather systems are queuing up | 0:01:22 | 0:01:24 | |
right across the Atlantic to come into the UK | 0:01:24 | 0:01:26 | |
on a jet stream which is no longer | 0:01:26 | 0:01:28 | |
looping up and down, | 0:01:28 | 0:01:29 | |
but it is taking a more direct | 0:01:29 | 0:01:31 | |
straight line towards us. | 0:01:31 | 0:01:32 | |
It is a zonal jet stream - | 0:01:32 | 0:01:34 | |
it is stronger and on it, | 0:01:34 | 0:01:36 | |
there are more active weather systems | 0:01:36 | 0:01:37 | |
and they're coming right for us so, for Friday into the weekend, | 0:01:37 | 0:01:40 | |
well, things will look and feel very different out there. | 0:01:40 | 0:01:43 | |
Let's take things day by day. | 0:01:43 | 0:01:44 | |
We will start with Thursday's weather | 0:01:44 | 0:01:46 | |
and there is a band of rain | 0:01:46 | 0:01:47 | |
pushing through Scotland and Northern Ireland, | 0:01:47 | 0:01:49 | |
heavier for a time before clearing in the afternoon | 0:01:49 | 0:01:51 | |
as sunny spells and scattered showers follow, | 0:01:51 | 0:01:54 | |
some of that rain heading into | 0:01:54 | 0:01:55 | |
northern and western England into Wales, | 0:01:55 | 0:01:57 | |
the far south-east staying dry until after dark, | 0:01:57 | 0:01:59 | |
not as much sunshine, not as warm | 0:01:59 | 0:02:01 | |
and by Friday morning, | 0:02:01 | 0:02:02 | |
it's quite chilly out there. | 0:02:02 | 0:02:04 | |
Northern Scotland fares reasonably well | 0:02:04 | 0:02:06 | |
on Friday, but for the rest of the UK, | 0:02:06 | 0:02:07 | |
rain pushing south-eastwards, | 0:02:07 | 0:02:09 | |
but then again, you might want something on your garden | 0:02:09 | 0:02:11 | |
after it's been, for some of us, quite dry. | 0:02:11 | 0:02:13 | |
And then this is the picture going into the weekend, | 0:02:13 | 0:02:16 | |
I showed you it again a second ago. | 0:02:16 | 0:02:17 | |
You can follow this weather system | 0:02:17 | 0:02:19 | |
all the way back almost to North America | 0:02:19 | 0:02:22 | |
and all of that is coming our way. | 0:02:22 | 0:02:24 | |
It won't be raining all the time. | 0:02:24 | 0:02:26 | |
I think some of the heaviest rain | 0:02:26 | 0:02:27 | |
will be focused on western parts of the UK, | 0:02:27 | 0:02:29 | |
into the hills and maybe Wales, for example, | 0:02:29 | 0:02:31 | |
will see quite a lot coming down into the hills. | 0:02:31 | 0:02:33 | |
Another spell of rain sweeping eastwards on Sunday, | 0:02:33 | 0:02:36 | |
showers following on behind. | 0:02:36 | 0:02:37 | |
Sunday looks like the windier of the two this weekend | 0:02:37 | 0:02:40 | |
and it's in the wind, particularly, | 0:02:40 | 0:02:42 | |
things are feeling cooler. | 0:02:42 | 0:02:43 | |
Then into the start of next week, | 0:02:43 | 0:02:45 | |
still low pressure close by | 0:02:45 | 0:02:46 | |
so it's still looking unsettled. | 0:02:46 | 0:02:48 | |
Another push of cooler air | 0:02:48 | 0:02:49 | |
looks like it will come in, | 0:02:49 | 0:02:51 | |
but as we get to the jet stream, | 0:02:51 | 0:02:52 | |
look at this. | 0:02:52 | 0:02:54 | |
It's no longer right across the Atlantic | 0:02:54 | 0:02:55 | |
towards us, it's doing that looping thing again | 0:02:55 | 0:02:58 | |
so it looks like the mobility is slowing down | 0:02:58 | 0:03:01 | |
so pressure systems hang around longer. | 0:03:01 | 0:03:04 | |
Low pressure at the start of the week, | 0:03:04 | 0:03:05 | |
but looks like later in the week, | 0:03:05 | 0:03:08 | |
there'll be a gradual progression to high pressure | 0:03:08 | 0:03:10 | |
coming back into the UK | 0:03:10 | 0:03:12 | |
and the influence of that will be | 0:03:12 | 0:03:14 | |
to settle things down for many of us, | 0:03:14 | 0:03:16 | |
turn things drier once again. | 0:03:16 | 0:03:17 | |
It could be pleasant by day, | 0:03:17 | 0:03:19 | |
but there is a risk of some cold frost overnight. | 0:03:19 | 0:03:22 | |
So, a weather pattern at the end of next week | 0:03:22 | 0:03:25 | |
pretty similar to what we have at the moment, | 0:03:25 | 0:03:27 | |
in between something much more changeable, | 0:03:27 | 0:03:29 | |
for which, of course, | 0:03:29 | 0:03:31 | |
we can blame the jet stream. | 0:03:31 | 0:03:32 | |
The psychiatrist was a figment of his imagination. | 0:03:34 | 0:03:37 |