18/12/2017 Weather for the Week Ahead


18/12/2017

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As ever we'll try to give you as much

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detail as we can about the run-up to Christmas itself

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and then later on in this show we'll have a look at some

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of the trends we could expect to see

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right through the Christmas period.

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That's some way off.

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Let's start with the detail and with a ridge of high pressure

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dominating the scene in the first part of the week.

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Certainly it will do us for Monday and Tuesday

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but it doesn't come without its problems.

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It's a decent enough day once we get rid of the early

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frost across central and eastern parts.

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Could be a bit of fog in the mix, some of that quite dense.

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But that ridge not doing enough to keep

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the fronts at bay from the far north of Scotland.

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Milder here certainly but wet and windy.

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Further south and east you've got some dry,

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fine weather to be had but it's on the cool side and we maintain that

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cool theme as we get on through the night between Monday and Tuesday.

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But my real concern is not the temperatures,

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it's the extent of the fog.

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That's why even at this distance we're highlighting

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a number of areas that could be very badly affected,

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not just for the morning rush hour.

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It is that time of year that once it forms on certain days it

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just doesn't clear.

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Mild enough across western exposures,

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I don't think you'll see much fog here.

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Some low cloud certainly and some drizzle as well.

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Temperatures 11-12 but in the east particularly

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if you hold on to that fog, which you could do all day,

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five, six, seven degrees, maybe lower.

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Come Wednesday we're just pushing this weather front down

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and through that area of high pressure.

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This will be the first, perhaps for some,

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the only meaningful rain of the week.

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Behind it the skies begin to clear, Generally speaking,

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because of the flow coming in from the west

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and south-west it's another mild day for the time of year.

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We've already highlighted a number of themes that we'll see

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repeated through the week. It will be mainly dry but cloudy.

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Always mildest out towards the west.

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But please remember some of those mornings and on into the afternoon

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in a number of locations that fog could be really dense and linger.

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Same weather front dragging its way slowly into the southern

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portion of the British Isles as we start the second half of the week.

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Pretty dank, miserable affair here I'm afraid.

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Further north a chance of brightness.

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Could be a chilly start for some.

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Maybe a little mist and fog returning as well.

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Single figure temperatures here quite widely.

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Across the south, yes, still relatively mild

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but little in the way of sunshine until we push that front away.

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Build in the high pressure gives a settled look to Friday

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but fronts trying to get

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into the west on a noticeable west to

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south-westerly breeze. Keeping it mild.

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Here we go towards the weekend and into the Christmas period itself.

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We suspect the most likely set-up is this one.

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High pressure trying to hang on down towards the south.

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But an area of low pressure further north could generate a mild

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south-westerly flow.

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That's if we keep the low pressures for the most part away

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towards the north-western quarter of the British Isles.

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But should it slip away towards the north-east,

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that will allow us to end up on the western flank, particularly on the

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northern half of the British Isles of that low pressure

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and that allows a feed of relatively cold air to

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get into the northern parts of the British Isles.

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So we have two likely scenarios to take us through the weekend

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before Christmas, through Christmas Day and into the rest of the week.

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Most likely mild, it could turn briefly colder in the north.

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Some of those lows could be quite vigorous

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so it could turn for some really wet and windy.

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