Friday evening forecast 15/09/23

15 September - National weather forecast presented by Aidan McGivern.

Transcript

00:00Hi there, for many it will be a fine start to the weekend, but through the weekend, humidity

00:05will climb and pressure will lower. As a result, some thundery rain is expected by Sunday.

00:11It could be some thunderstorms floating about overnight actually across parts of West Wales

00:15into the southwest of England. These will be very hit and miss, lightning a possibility,

00:20heavy rain fairly isolated. There will be a band of rain continuing across central and

00:25southern Scotland, parts of Northern Ireland, Northern England as well overnight. This becomes

00:29a bit more fragmented later in the night, but it keeps temperatures at around 9, 10,

00:3211 Celsius through the central slice. To the north of that, we're into the cool air. Northern

00:37Scotland under any clear spells could dip to 2 to 3 Celsius, whilst the warm air remains

00:44in the south with temperatures no lower than 15 or 16 Celsius. A bit more cloud around

00:49across western and southwestern parts of the UK compared with Friday morning and always

00:54that possibility of a thundery shower during the morning. Now, these will tend to ease

00:59away during the middle part of the day and plenty of very warm sunshine across much of

01:04England and Wales, even across the central slice where we've seen a wet day on Friday.

01:08The rain tends to peter out, leaving an area of cloud, but it turns increasingly dry in

01:13many places. Northern Scotland and central Scotland, in fact, a crisp autumnal day with

01:19sunny spells, just the odd shower in the far north, but otherwise temperatures at around

01:2314, 15 Celsius typically. But the warmth there continues, as I said, in the south

01:28and southeast, 24 to 26 Celsius fairly widely, especially where we get some sunshine. It

01:34will be fairly blustery through this central zone where we've got the cloudier skies and

01:38the rain petering out. And then, as we go into Saturday night, there's an increased

01:43risk of thundery showers developing initially towards the southwest, drifting into parts

01:47of Wales. Again, hit and miss. Not everyone will see one of these, but really the risk

01:52increases through the hours of darkness. Northern Scotland, meanwhile, perfect aurora

01:57viewing conditions and it looks like it will be a good night for the aurora, but it will

02:02be chilly. The first, I'd say, widespread frost of the season for northern parts of

02:07Scotland under those lengthy clear spells and in the cooler airflow. Further south,

02:1217 or 18 Celsius possible by dawn on Sunday because we've got more humid air arriving

02:18from the south. An area of low pressure is milling around just off Iberia and that's

02:24just going to reorientate so that we bring more and more humid air northwards and also

02:29the pressure lowers. So, the combination of those two factors will lead to an increased

02:33risk of thundery showers breaking out initially towards southwestern parts. A drier start

02:38to Sunday in the north and the east with some sunshine, but increasingly this humid air

02:44moves north. That will lead to a warmer afternoon for Scotland, but a cloudier afternoon and

02:50for many parts of the country, by the afternoon there is some heavy thundery rain. This won't

02:55affect everyone. Some places will largely stay dry, but some of this thundery rain will

03:01be intense, could cause some issues, lightning as well, an additional hazard. So, that's

03:08Sunday and it's still going to be warm as that humidity drifts northwards, but temperatures

03:14a bit more limited in the south I think, given the cloud and those outbreaks of rain. Then

03:19as we go into early next week, thundery showers again on the menu for Monday, but as those

03:25sweep away, it's going to turn cooler widely across the UK with some areas of low pressure

03:31lined up to arrive midweek.