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Hello. You don't hear so much about the jet stream at this time of year. | 0:00:02 | 0:00:05 | |
That's because it's not as strong as it is in the winter, | 0:00:05 | 0:00:07 | |
when it thrives off a strong thermal gradient | 0:00:07 | 0:00:09 | |
between cold air to the north of us and warmer air in the tropics. | 0:00:09 | 0:00:12 | |
That gradient is there at this time of year, but it is not as strong. | 0:00:12 | 0:00:14 | |
The jet stream isn't as strong. | 0:00:14 | 0:00:17 | |
This is how it looks this week, | 0:00:17 | 0:00:18 | |
it's prone to meandering, not doing very much. | 0:00:18 | 0:00:20 | |
And look at this, it's splitting this week. | 0:00:20 | 0:00:22 | |
One portion is going to the north and another is diving to the south. | 0:00:22 | 0:00:25 | |
This, though, is important. | 0:00:25 | 0:00:27 | |
This circulation here near Spain, it's a cut-off low-pressure, | 0:00:27 | 0:00:31 | |
one which isn't moving very much with the flow, | 0:00:31 | 0:00:33 | |
it's hanging around for a few days. | 0:00:33 | 0:00:34 | |
But it is going to impact our weather, | 0:00:34 | 0:00:37 | |
because around it it's going to push warmer, more humid air our way | 0:00:37 | 0:00:40 | |
with a potential for some thundery downpours later this week, | 0:00:40 | 0:00:44 | |
as we'll see in just a moment. | 0:00:44 | 0:00:45 | |
Let's start off, though, | 0:00:45 | 0:00:47 | |
with how Tuesday's weather is shaping up. | 0:00:47 | 0:00:49 | |
And we do have a weather front around | 0:00:49 | 0:00:51 | |
and a weather system bringing some rain to Northern Ireland, | 0:00:51 | 0:00:53 | |
parts of Scotland and northern England. | 0:00:53 | 0:00:55 | |
And not just as Tuesday begins, but for much of the day. | 0:00:55 | 0:00:59 | |
So quite a cool, soggy day for Northern Ireland, | 0:00:59 | 0:01:02 | |
through southern Scotland, into the Central Belt | 0:01:02 | 0:01:04 | |
and northern counties of northern England, | 0:01:04 | 0:01:06 | |
from Lancashire across to North Yorkshire. | 0:01:06 | 0:01:08 | |
South of that, a few showers, but sunny spells developing. | 0:01:08 | 0:01:11 | |
Quite a range of temperatures, | 0:01:11 | 0:01:13 | |
from as high as 25 in central London | 0:01:13 | 0:01:15 | |
to maybe just 13 degrees if you are in the rainy zone | 0:01:15 | 0:01:18 | |
here in southern Scotland. | 0:01:18 | 0:01:20 | |
Now, this weather front is still hanging around for Wednesday, | 0:01:20 | 0:01:22 | |
but there isn't much in the way of rain left on it. | 0:01:22 | 0:01:25 | |
Still a lot of cloud in the same areas that saw the rain on Tuesday. | 0:01:25 | 0:01:28 | |
By Wednesday, maybe some spots of light rain and drizzle, | 0:01:28 | 0:01:31 | |
but just not as wet. | 0:01:31 | 0:01:33 | |
Sunny spells in northern Scotland, | 0:01:33 | 0:01:34 | |
but notice, blue sky and sunshine for more of England and Wales, | 0:01:34 | 0:01:38 | |
allowing temperatures to edge up further. | 0:01:38 | 0:01:40 | |
This is the warmth and humidity starting to build. | 0:01:40 | 0:01:43 | |
And look at that, some spots will be getting close to 30 Celsius | 0:01:43 | 0:01:47 | |
once again in that sunshine. | 0:01:47 | 0:01:49 | |
But the area of low pressure, that cut-off low, | 0:01:49 | 0:01:52 | |
begins to show its hand more by Thursday. | 0:01:52 | 0:01:54 | |
There is some moisture around that, warmth and humidity, | 0:01:54 | 0:01:58 | |
and you get some thunderstorms breaking out | 0:01:58 | 0:02:00 | |
initially towards the south-west of the UK on Thursday | 0:02:00 | 0:02:03 | |
and then pushing gradually northwards, | 0:02:03 | 0:02:06 | |
where it is still a bit warmer, just not as warm as it is to the south. | 0:02:06 | 0:02:08 | |
Although temperatures may be pegged down a little bit | 0:02:08 | 0:02:11 | |
because there's more cloud around and those storms breaking out. | 0:02:11 | 0:02:14 | |
That system pulls away to the east during Friday. | 0:02:14 | 0:02:17 | |
We're in between weather systems on Friday. | 0:02:17 | 0:02:19 | |
A lot of dry weather around. | 0:02:19 | 0:02:20 | |
Still a chance of catching a few heavy showers, mind you. | 0:02:20 | 0:02:23 | |
And there's still some heat to be had, | 0:02:23 | 0:02:25 | |
particularly across south-eastern parts of the UK. | 0:02:25 | 0:02:28 | |
But as we go from Friday into the weekend, | 0:02:28 | 0:02:31 | |
this cold front is important, pushing through. | 0:02:31 | 0:02:34 | |
And the jet stream becoming a little bit more of a combined feature | 0:02:34 | 0:02:37 | |
after that split earlier in the week, | 0:02:37 | 0:02:40 | |
allowing Atlantic air to come through, | 0:02:40 | 0:02:42 | |
so it's going to be a bit cooler and fresher over the weekend. | 0:02:42 | 0:02:45 | |
But with low pressure close by, it looks fairly unsettled | 0:02:45 | 0:02:47 | |
with either some rain or showers around | 0:02:47 | 0:02:50 | |
and the breeze picking up, as well. | 0:02:50 | 0:02:51 | |
Now, going into next week, | 0:02:51 | 0:02:52 | |
it looks like a more typical weather pattern for the summer. | 0:02:52 | 0:02:56 | |
High pressure, the Azores high | 0:02:56 | 0:02:58 | |
beginning to build in across southern parts of the UK. | 0:02:58 | 0:03:00 | |
Low pressure sticking around close to the north-west. | 0:03:00 | 0:03:03 | |
So a range of weather in this more typical summer pattern | 0:03:03 | 0:03:06 | |
for the UK into next week. | 0:03:06 | 0:03:07 | |
And it looks like being, with the position of these pressure systems, | 0:03:07 | 0:03:10 | |
a north-west/south-east split. | 0:03:10 | 0:03:12 | |
As a result, parts of Scotland, Northern Ireland, northern England | 0:03:12 | 0:03:15 | |
will see some of the windiest, wettest weather, | 0:03:15 | 0:03:17 | |
though it's not going to be a wash-out. | 0:03:17 | 0:03:18 | |
It's not going to be unsettled all the time. | 0:03:18 | 0:03:21 | |
But it will be drier and relatively warmer | 0:03:21 | 0:03:22 | |
across south-eastern parts of the UK. | 0:03:22 | 0:03:24 | |
But even here, a few weather systems could move through | 0:03:24 | 0:03:27 | |
from time to time. | 0:03:27 | 0:03:28 | |
That's how it's looking. | 0:03:28 | 0:03:29 |