09/03/2018 Weather for the Week Ahead

Hello. We talk a lot on Weather for the Week Ahead about the jet stream

because it is crucial in driving weather systems around the world.

The winds high up in the atmosphere steering areas of low pressure

but also dividing warm air from cold.

Recently the jet stream has been to the south of the UK,

keeping us in the cold air.

But watch what happens as we head towards the weekend,

the jet stream will slide northwards and that will allow us

to bring in some milder air from the south.

In fact, through the weekend, some pretty high temperatures.

Some spots may be 15 or 16.

But with that in close proximity to the jet stream there will be

areas of low pressure so we'll see some outbreaks of rain.

And there's some rain to come in places during Friday,

spreading across the Channel Islands into southern parts of England,

perhaps south Wales through the afternoon.

To the north of that after a cold,

frosty start with some mist patches it will turn into a mainly

dry day with spells of sunshine,

some showers into the north-west of Scotland and temperatures of 8-11.

This area of low pressure developed by the jet stream will be

spinning around to the south-west of Britain on Saturday.

Frontal systems pushing forwards but follow the isobars,

a southerly flow so that's where the mild air will be coming from.

During Saturday we'll push this area of rain out of northern England

and Northern Ireland into Scotland where it could well give some

snow over the hills.

At low levels it will mostly be rain

because all the while we will be bringing this milder air

up from the south and I think Saturday is the day,

given a bit of brightness in the south-east

corner we could get to 15 or 16.

Sunday is likely to start off with some mist and fog patches.

A lot of low cloud as well.

Things should brighten up for many with some spells of sunshine.

Showers likely to be spreading across the southern

half of the country.

Some of these heavy. Still pretty mild, even in Edinburgh up to 10.

A high of 14 in London.

Low pressure remains the dominant feature as we move

into the start of the new week.

In fact there could be three different low pressure

centres at this stage.

A lot of uncertainty about exactly where each

area of unsettled weather will move

but there will be some outbreaks of rain at times.

Potentially still some snow over high ground in the north

but generally it will be rain

because we're going to stick with that slightly milder feel.

8 degrees in Aberdeen, 12 in London.

Looking ahead to Tuesday it may well be that an area of high

pressure starts to build in from the south temporarily

so more in the way of dry weather.

Could be some mist and fog patches first thing but Tuesday at this

stage looks like a mainly fine day with some spells of sunshine.

Still relatively mild, 9-11 or 12.

As we move through the middle and latter part of next week we're going

to see further areas of low pressure drifting in from the south-west.

So it stays pretty unsettled.

There will be some spells of rain at times.

But I want to show you the jet stream for the end of next week

because by this stage we're expecting it to have dived its

way southwards once again

and that leaves the potential for some colder air from the north.

Particularly by the time we get into next weekend.

It's by no means a done deal just yet

but it looks like the end of next week will bring some

rain at times, equally some spells of sunshine.

Could be windy at times and just the potential that into next weekend

things may turn a little colder and it's all because of the jet stream.

We'll keep a close eye on that over the next few days.