Friday 20th December 2024

Colder for the weekend, milder for Christmas, a bit of rain, a bit of sun and perhaps even a flake of snow.

It could definitely be worse.

Thanks to Christel for the photograph.

The general picture sees high pressure to the south, low pressure to the north, and we are in a westerly flow. Pretty standard really.

Friday morning starts pleasant with spells of hazy sunshine. Cloud will thicken during the morning with some patchy rain in the afternoon – not amounting to much, though the odd heavyish burst late afternoon before it clears away. Around 8’C and breezy. Clear skies for a time overnight, though cloud thickening again later. Down to around 3’C.

Saturday starts cloudy as another fairly weak weather front crosses. Some patchy mostly light rain around, the odd heavyish burst possible. Some sunny spells possible from late morning onwards, still the odd splash of rain possible, but it gradually become drier and sunnier (if hazy) as the afternoon goes on. Briefly milder, reaching around 12’C and also rather windy. Colder air spreading down overnight once more, down to around 3’C. Still quite windy, and a mixture of clear skies, some cloud and perhaps a shower or two – which should be of rain, but not impossible to see a wintry mix.

Sunday will be a cold day in a strong north-westerly wind. Sunny at times, but the wind will be strong enough to push wintry showers quite far inland, more likely falling as rain or sleet – but snow or hail possible, at least in the morning hours. Reaching around 6’C but feeling colder in the strong wind. A chilly night but probably too much wind for a frost, down to around 3’C.

Monday will be a chilly day but the wind will fade and there will be sunshine for much of it, though increasingly hazy as the afternoon goes on. Around 6’C. Bits and pieces of light rain in the evening and overnight, and temperatures ticking up a bit as milder air arrives, say 8’C.

For Christmas Eve we have high pressure to the south asserting more influence again. Yet another “if only it was summer” set up.

A mostly cloudy day, some bits of light rain possible at times, but also some sunny breaks probable. Mild, around 12’C. Most likely fairly cloudy overnight, around 9’C.

Christmas Day will more likely be on the cloudier side of the spectrum, though I wouldn’t rule out a sunnier day. Mild, around 11’C.

Boxing Day looks similarly calm – more likely to be on the cloudier side of the spectrum, if not outright cloudy, but again not possible to rule out a sunnier day. Around 9’C.

Calm and settled conditions are likely for Friday and next weekend, cloud amounts uncertain though something on the cloudier side of the spectrum more likely than not. Should we have clear skies at night, then fog/frost possible, but again, cloudy skies more likely than clear skies.

Broadly this theme should persist well into January, high pressure often over the south of the UK, leading to settled conditions for much of the time, often cloudy, probably mild at times.

Some variations to the theme as high pressure shifts around, short cold spells, some weather fronts, etc – but settled and fairly cloud conditions should be the main trend for the next few weeks.

Next forecast will either be Monday or Tuesday next week.

I wish you all a pleasant weekend – I shall hopefully be getting over this really stinking cold/bug/covid that has knocked me out this week, ready to enjoy Christmas. At least my shopping is done!…

Monday 16th December 2024

Plenty more cloud to come, but some sunshine at times…and some rain at times.

No photograph this week…even I didn’t take one, outdoors anyway.

So the general picture to start the week sees high pressure centred over France, and a milder westerly flow.

Plenty of cloud for Monday but some sunshine at times, though more likely of the hazy variety. Reaching around 11’C in a moderate breeze. Some clear spells at first tonight, but cloud thickening later – perhaps some patchy mist/fog by dawn. Down to around 4’C.

Tuesday will again be mostly cloudy, some bright spells, and a chance of a shower at some point during the day. Around 10’C and again quite breezy. Weather fronts will cross during the evening and overnight bringing some bits of rain, but nothing especially much. Windy too and milder, 13’C.

Wednesday starts cloudy, some bits and pieces of light rain. Some hazy sunshine probable for the afternoon. Generally quite windy, if not windy, and mild at 14’C. An area of heavy rain will spread up from the south-west in the evening, timing a little uncertain – the rain potentially very heavy at times. Mild whilst raining, but cooler once it clears – say down to around 6’C.

Colder for Thursday in a more north-westerly flow. Plenty of sunshine though, a bit of cloud around at times – a small chance of a shower but unlikely they get this far inland. Around 6’C and feeling colder in the wind. Reasonably clear skies overnight and a fairly cold night, down to around 1’C – a frost possible, though perhaps too windy still.

Some sunshine for Friday, though cloud tending to increase later in the day. The breeze more westerly but still chilly, around 7’C or so. A band of showers crossing at some point in the evening/overnight – dry either side and around 6’C.

Saturday looks a bit of a mish-mash, some sunshine possible at times but a weak-ish weather front will cross bringing cloud and bits and pieces of rain at some point. Around 10’C and windy.

Sunday has more uncertainty on details, outright wet is unlikely though some bits of rain possible, probably on the cloudier side of the spectrum, though with some sunshine. Windy, around 8’C.

Christmas week looks mild, if not very mild. Often dry though some rain possible at times, uncertain on cloud/sunshine amounts. Good news for those with travel plans, bad news for those who like the romance of a White Christmas.

It’s still far enough away to plausibly change, it’s not scientifically impossible that we instead get a cold spell…but mild and fairly dry looks highly likely.…

Friday 13th December 2024

More gloom to come, though some variations on the theme.

Photograph comes from me on a dreary, drizzly morning the other day.

The general set-up is one where we are in-between influences – our current high pressure slipping away to the east, low pressure to our north and south, and the next high pressure to our west. Meteorological no-man’s land.

So Friday remains cloudy, dull with drizzle at times. A chance of an occasional glimpse of sunshine. Pretty chilly, 5’C. Mostly cloudy with bits and pieces of light rain or drizzle overnight, 5’C.

Saturday starts cloudy with some bits of light rain. But this clears south-east as a north-westerly breeze picks up – and there will be some sunshine from roughly midday onwards. Probably still some cloud, the sun perhaps hazy – but some sunshine at least. 7’C. Clear-ish skies at first but cloud thickening as the night goes on, down to around 3’C at first but picking up a bit later.

Sunday is back to cloudy, again perhaps a spot of light rain at times. Cannot rule out a bit of sunshine at times though, more likely in the morning. Much milder than it has been, around 12’C and breezy. Mostly cloudy overnight, the odd bit of light rain/drizzle and around 9’C.

Monday sees high pressure now centred over France – a heat-lover’s dream were it summer.

Some uncertainty on cloud amounts, more likely on the cloudier side of the spectrum with limited sunshine, but I’m not especially confident – there’s a small chance of a much sunnier day instead. Around 12’C with a bit of a breeze. Most likely cloudy overnight, around 8’C.

Tuesday most likely is cloudy, or mostly so – weather fronts are likely to be pushing in by the end of the day so the chance of some bits of rain later in the day will increase, and becoming quite windy too. Around 10’C. Cloudy with some showery rain overnight, around 10’C – and windy.

Most likely Wednesday will be cloudy with some rain at some points in the day, around 11’C and most likely windy too.

For Thursday and Friday, a north-westerly flow looks more likely. So temperatures back down around normal, say 8’C, windy, some sunshine, perhaps some showers at times.

With something broadly similar to that next weekend being more likely.

Any chance of a White Christmas? Well, it’s not possible to rule it out, but I’d give a chance of snow on Christmas Day no higher than a 2% chance as it stands. Frost around an 8% chance.

More likely we’ll be in a mild westerly flow.

Have a good weekend…I have to brave Oxford Street tomorrow to finish the Christmas shopping…yuck.…

Monday 9th December 2024

The storm has gone and boring is back. Fairly cold, fairly dry and mostly cloudy this week.

Thanks to Chris for the photograph.

So the general picture to start the week sees the remnants of Storm Darragh towards Italy, and high pressure is building over the north of the UK – which should last in place until the weekend, if not longer.

Today will be mostly cloudy, some occasional bits of light rain, some sunny breaks also. Feeling chilly in the north-easterly wind, around 7’C. Cloudy overnight, the odd bit of light rain possible, around 6’C.

Tuesday will be mostly cloudy and mostly dry – bar the odd bit of light rain/drizzle. Around 6’C and still feeling rather chilly in the north-easterly wind. Mostly cloudy and mostly dry overnight, around 4’C.

Wednesday will again be cloudy all day, perhaps a little sunshine in the afternoon. 6’C in an easterly breeze. Mostly cloudy overnight though a few clear breaks possible – perhaps some drizzle by dawn, around 3’C.

Thursday again looks mostly cloudy, perhaps a bit of sunshine at times, and also a greater chance of some showers which should be on the light side of the spectrum. Around 7’C in fairly light winds. Probably cloudy overnight, around 5’C.

Friday probably will be cloudy all day once more, a chance of some light rain/drizzle at times, and temperatures roughly around 6’C. Perhaps less cloud overnight – which means a chance of frost/fog, though low confidence at this stage.

For the weekend, our area of high pressure slips towards south-east Europe, but a new area is waiting to the west.

Details still a bit sketchy for the weekend, but current thinking is that Saturday may have a weak weather front brining cloud and some patchy rain – though clearer skies once it has cleared. And temperatures around 7’C. Frost possible overnight.

Sunday more likely to see sunshine, or hazy sunshine – depending on how close weather fronts are to our north.

Aforementioned weather fronts will arrive at some point early next week (well, almost certainly will) – though high pressure may hold them away for a day or two. Once they break through, an unsettled week is probable.

I’ll be back later in the week.…

Winter Weather Forecast 2024/25

Welcome to the winter weather forecast 2024/25 for Reading & Berkshire.

Firstly the usual caveats – seasonal forecasting is difficult, no seasonal forecast will ever be 100% correct, as it is bound to events on a local and global scale.

Seasonal forecasting is done mostly on a global level, and also thought of in monthly terms – for example, the background signals and long-range models could suggest higher than normal pressure is likely one month, but that wouldn’t stop one week or more being under low pressure, and wet.

So you should always expect any seasonal forecast as a rough guide at best, and remember that I’m not a professional – just an amateur forecaster with a half-decent grip on what models are suggesting, and a decent writing ability.

My autumn forecast was…alright…I picked some things out correctly, for example the greater chance of northerly flows than normal in November, but then I also picked out a wet start to November, and it was dry.

Also a massive thanks to those who sent photographs in, and more so to those who do on a regular basis.

Thanks to Clare who’s photograph I’ve chosen – a small charity donation will be sent as a thank you, please let me know to whom.

Background Signals

Winter always has more impactful background signals than any other season, but that never is the whole story – events do and will deviate from this.

The Quasi-Biennial Oscillation is currently in westerly phase, which increases the chance of westerly winds, and hence milder, wetter conditions.

La Niña, though not the strongest, does tend to increase the chance of northerly flows in autumn and early winter (as we have already seen).

Sea surface temperatures around most of the UK, and especially to the west, are warmer than normal – so this will mean temperatures more likely to be higher than normal. However, to our north, sea surface temperatures are colder than normal – so northerly flows may have more impact in terms of cold than normal.

The Indian Ocean Dipole is forecast negative for the start of winter, which can increase the chances of colder northerly flows.

Finally, the Madden Julien Oscillation, which is only helpful (questionably so in my view) over the more medium-term, currently is forecasted to end up in phases which favour cold weather later in December.

A sudden stratospheric warming event (SSW) cannot be discounted, which is where the stratosphere (the atmospheric layer above our troposphere) suddenly warms, which can break apart the polar vortex and cause cold weather to flood down in our direction – the Beast From The East in 2018 being the classic example.

However, we had 3 such events last winter, a once in 250 years occurence – the first two arguably gave us much milder and wetter conditions, as the cold air from the Arctic, if I remember correctly, flooded south but to our west – and hitting the (relatively) warm Atlantic ocean caused large areas of low pressure – and the mild/wet conditions. And also caused the latter part of my winter forecast to fail!

And the third happened in March, too late for wintry weather but then caused a cooler than normal spring.

I’ve read arguments that La Niña combined with a westerly QBO increases the chance of an SSW occurring over winter…which is what we have. But not sure what to make of that.

So quite a lot of different background signals, but definitely some patterns including increased chances of northerly flows in early winter – as such it is time to start the forecast.

December

December looks a very variable month, especially to start. It should settle down after the first week, with temperatures around normal or a little below, though some showers possible in the easterly flow. Frost/fog will be possible.

After mid-month, something more changeable looks more likely with further heavy rain and strong winds at times – chances of more named storms, though temperatures most of the time above average – short colder snaps still possible.

Towards Christmas and into the New Year period, colder northerly flows become more possible, though westerly flows could still dominate. Expect changeable conditions, wind and rain at times, some sunnier and colder days too. Again, quite a mix seems most likely, though perhaps veering towards dry more than wet.

Overall I expect above average rainfall, around or slightly below-average sunshine, around average temperatures.

Confidence level 80%.

January

January again looks a fairly mixed month. The start of the month has greater chances of drier and colder weather, before becoming unsettled once more. Northerly flows very possible, named storms very possible.

In the second half of the month, something milder and changeable seems more likely – some rain at times, but also some dry spells, if perhaps cloudy and dry.

Overall I expect around average rainfall, slightly below-average sunshine, and slightly above-average temperatures.

Confidence level 60%.

February

Suggestions for February see higher than normal pressure over Europe, so something milder and drier than normal seems the more likely general outcome for the first half of the month – though some weather fronts will likely get through to bring some rain, albeit more limited amounts.

More likely it stays mild or very mild in the latter half of February, with dry conditions more likely than wet.

A sudden stratospheric warming event would increase the chance of cold and dry for February, considerably…but this is impossible to know at this stage.

Overall I expect rainfall to be below average, sunshine around or slightly-above average, temperatures above average, though with some uncertainty towards the end.

Confidence level 50%.

Summary And Early Spring Thoughts

So a pretty mixed winter seems more likely, though not quite as wet as it has been with high pressure playing more of a role than it has the last 18 months or so. Any cold spells more likely in the first 6 weeks of winter, and those from the north.

Early signs for spring, assuming no sudden stratospheric warming, are for a much warmer and drier first half of spring. Oh do hurry up!…

Friday 6th December 2024

A busy weekend with Storm Darragh on the way, followed by a fairly cold blast from the north, though then settling down next week again.

The general picture sees our previous low pressure moving away today – and Storm Darragh developing to the west.

Friday starts sunny. High cloud will arrive during the morning, and it will slowly thicken during the day – but will remain bright with hazy sunshine. Around 8’C. Bits and pieces of rain possible by late afternoon, but more so in the evening. Outbreaks of rain until around midnight, give or take, then mostly dry, and becoming windy. Up to 13’C in the evening rain, but dropping after.

Saturday sees further rain spread down from the north-west, mostly light or moderate rain, but the odd heavy burst possible. Quite persistent for a time in the morning, more showery in the afternoon. Feeling much colder in the strong wind, gusts up to 50mph possible though strong winds all day. 50mph is enough for some isolated damage/disruption but isn’t out of the usual for winter. 6’C at best. Strong winds continue overnight, bits and pieces of light/moderate rain possible at times too.

By Sunday, Storm Darragh will be focused over Belgium/Netherlands, but still close enough for us to have strong winds, from the north-east – the North Sea is still relatively mild, but if it were January/February then this set-up could allow snow. As it is, we’ll be cloudy with bits and pieces of rain, sometimes dry, sometimes raining, and feeling cold in the strong north-easterly wind, around 7’C. Overnight remaining mostly cloudy, dry most of the time but still some bits of light rain possible, and winds easing somewhat. Around 6’C.

By Monday, the remnants of Storm Darragh will be towards Sardinia, and we’ll have high pressure building to our north.

Mostly cloudy, some occasional bits of light rain – a few glimpses of sunshine possible and around 7’C. Still quite windy, but not like it has been. Cloudy overnight, down to around 4’C.

Tuesday has some uncertainty on cloud amounts – more likely on the cloudier side of the spectrum, but I wouldn’t rule out something on the sunnier side. Still chilly in the easterly breeze, around 6’C. More likely on the cloudy side overnight, so around 3’C – but clearer skies and a frost possible instead.

For the rest of the week, high pressure will remain in control. Uncertainty remains in terms of cloud amounts for each day and overnight – any clearing of skies overnight will allow frost and possibly fog. But otherwise it will just remain chilly.

Daytime temperatures around 6’C whether cloudy or sunny, night will depend on cloud amounts – around 5’C if cloudy, below 0’C if not.

Uncertain for next weekend as to whether high pressure can hold on – I think we’ll revert back to unsettled the week after, if not next weekend – the timing of the switch is uncertain.

I’ve half-written the winter forecast, I hope to finish it tomorrow on the train to Somerset…fingers crossed Storm Darragh doesn’t have other ideas. Have a pleasant weekend…and do keep an eye on Met Office warnings for Storm Darragh.…

Monday 2nd December 2024

A mixed week ahead with rather variable weather – though likely notably colder by next weekend again.

No photograph this week.

We start the week with low pressure over Scandinavia in charge, and a secondary low moving down through Britain – high pressure to our west.

A mixture of sunny spells and cloud to start the week, perhaps a shower. During the afternoon, cloudier skies will spread down from the north with bits and pieces of light/moderate rain. Breezy and around 10’C – though dropping a bit in the afternoon. Cloudy with bits of light rain in the evening, this fading overnight and cloud breaking up somewhat – down to around 3’C.

Tuesday will generally be a mix of sunny spells and cloudy spells, tending to be more cloud earlier in the day, though there will also be some high cloud in the afternoon that makes the sunny spells hazy. Around 7’C, maybe 8’C. Clear spells at first overnight, down to around 1’C – a frost possible in more prone spots. Tending to cloud over later as a weak weather front crosses, perhaps a bit of rain.

Wednesday may start with some cloud, perhaps a spot of light rain too, but this will break up quickly to be replaced with hazy sunshine for the rest of the day. Around 9’C. Cloud continues to thicken in the evening, with outbreaks of rain arriving from mid-evening onwards – quite patchy and light at first, but some heavy bursts likely after midnight, even a small chance of thunder. No lower than 9’C and windy too.

Thursday starts cloudy, some patchy rain still possibly lingering though should be on the light side. Uncertain as to whether it brightens up or stays cloudy – then further heavy showers are likely to arrive either late afternoon or during the evening. Milder, 13’C and quite windy. Showers at first in the evening and overnight – drier later, down to around 7’C. Likely windy, notably so in the evening showers.

Friday is probably dry with some hazy sunshine – though not especially high confidence. Around 8’C. Wind and rain probable in the evening and overnight, but much milder once more.

For the weekend, once the low moves out of the way we likely pull down a northerly flow again.

Saturday will depend on how the low pressure behaves, but potentially wet and mild to start – once the rain moves away then colder and showers. Windy too – possibly 12’C or so if there is still rain in the morning, 7’C once it clears and the colder air spreads down. A chilly night – roughly down to around 3’C but could be a couple of degrees either side. Feeling cold in the northerly wind.

Details a bit uncertain for Sunday, certainly cold in the northerly wind – but otherwise in terms of cloud/sunshine and showers chances it is uncertain. Around 5’C or so.

The more likely outcome to start next week could be on the cold and dry side.

I will endeavour to do the winter forecast this week at some point – though lots going on and I feel a bit off-colour this morning so, it’ll be out when it’s out!…

Winter Forecast Photograph Request

Winter starts tomorrow (though we’ve had a fair few cold days already), and it will be time to do the winter forecast.

And I will need a photograph, please.

Usual rules:

  1. Must feature weather. Must have winter weather of some description – there is more than one type of winter weather and I choose to fit the forecast, as best as possible.
  2. Must be the local area.
  3. Can be from any year…as long as it is winter weather.
  4. Must be landscape-orientated, ie the width longer than the height. I know plenty of people ignore this when posting on Facebook, which is totally fine, crack on. But I only use landscape-orientated images.

I will donate £10 to the charity of the winner’s choice…I will be in touch with whoever I choose.

Whoever’s photograph I choose will adorn the forecast and also be the cover photograph on Facebook for the next 3 months.

My life is easier if you add them to the Facebook post but you can also e-mail them, or send by Facebook message too.

Thanks!…

Friday 29th November

Fairly mixed and ordinary weather ahead, though mild this weekend.

Thanks to Karen for the photograph.

So we start the forecast period with high pressure close to our east (would be pretty glorious if a summer month) – low pressure to our west which is going to squeeze past to the north of the UK during the weekend.

Friday starts reasonably sunny though a fair amount of high cloud which will make it hazy at times – becoming completely sunny as the day goes on. Still on the cool side despite the southerly breeze, 9’C. A weak weather front will cross in the evening and overnight, bringing mostly cloud but perhaps the odd splash of rain. No lower than around 6’C.

Saturday starts mostly cloudy, perhaps a spot of drizzle. The sun should come out in the afternoon to an extent, though likely still quite a lot of cloud around – some uncertainty on cloud amounts, certainly possible it stays mostly cloudy all afternoon too. Much milder, 14’C. Mostly cloudy overnight, a bit of rain possible before dawn as a weather front edges in.

Sunday sees a weather front slowly cross from west to east, so a cloudy day with some showery rain at times – not always raining, some of the rain fairly light but potentially some heavy bursts mixed in too. Likely some sunshine before the end of the day. Around 12’C and breezy. Reasonably clear skies overnight, a small chance of a passing shower and down to around 8’C.

Monday sees the wind swing more to the north-west, quite a bit of cloud around – some bits of rain, but also some sunnier breaks too. Cooler, around 9’C and breezy. A frost possible overnight, though probably clouding over later in the night.

Tuesday should start dry but probably on the cloudy side. It looks like a weather front will cross either later in the day, or evening/overnight bringing rain – timing currently fairly uncertain. Reaching around 7’C.

Low confidence on details for Wednesday – more likely dry with some sunshine, though perhaps still some rain to clear in the morning, depending on the timing/track of Tuesday’s low. Around 8’C.

Low pressure probably takes over again for Thursday/Friday so more rain likely at some point.

Perhaps high pressure back for the weekend.

Generally – think changeable, rain at times, dry and sunny at other times, though the longer-term trend should be for drier conditions to be more often in place.

I will be doing the winter forecast soon…maybe this weekend.…

Monday 25th November 2024

Not a dry week, but a calmer week this week – the cold has gone, but the mild will disappear too.

No photographs so you’ll have to have one of mine – from the joy that is Oxford Street on a wet and windy November afternoon. Don’t worry…I wasn’t going shopping.

So we start the week with Storm Bert heading into Scandinavia, and high pressure will weakly form behind it.

Cloudy to start the day, but this will quickly move east to be replaced by sunny spells and a bit of patchy cloud. Around 11’C and breezy, if not quite windy at times. Clear skies at first overnight, though an area of cloud and perhaps a shower crossing through the middle of the night – down to around 5’C.

Tuesday looks mostly sunny. A bit of patchy cloud and then some high/mid-level cloud developing later in the afternoon as the next low pressure approaches. Around 9’C. An area of rain spreading across overnight – likely some heavy bursts mixed in, perhaps some very heavy rain briefly. Around 5’C.

Wednesday starts cloudy, probably still some rain at dawn (and perhaps heavy) – timing as to when it clears is uncertain, and could broadly be any time from 6am to 1pm when it finishes raining. A very small chance of some sleet/wet snow on the back edge. Likely quite windy, generally pretty chilly too – around 5’C. Maybe some sunshine by late afternoon, but again, timing on when the little low pressure clears is uncertain. Skies clearing overnight and a frost probable, more likely down to around -1’C, give or take. A small chance of fog forming.

By Thursday, our little low is in the North Sea, and high pressure is building behind it – but the next low pressure system, a rather huge system is spinning away in the Atlantic (which actually spawned Wednesday’s low pressure…kind of spat it out in a meteorological way).

Thursday should be mostly sunny if a bit on the chilly side. Some high cloud likely at times, perhaps a bit of patchy low cloud but mostly sunny. 7’C at best. Some high cloud pushing east overnight so uncertain how low temperatures will go, but more likely around 0’C which will mean frost possible, and a small chance of fog forming too.

Friday most likely bright with hazy sunshine – weather fronts trying to push in from the west but not getting anywhere. Around 8’C, maybe a tad more. Probably on the cloudier side overnight, down to around 4’C – though not especially confident on details.

Some uncertainty for the weekend, but it does look like high pressure will strengthen and keep the low pressure at bay.

Probably sunny on Saturday or at least on the sunnier side of the spectrum, and around 8’C or so. Probably clear skies overnight – so a frost possible and down to around 0’C.

And probably the same or similar for Sunday – sunny or on the sunnier side of the spectrum and around 7’C or so.

Not especially high confidence for the weekend – high pressure wouldn’t need to be much weaker for weather fronts to make more progress with cloudier skies with some rain – it is still a plausible outcome.

My expectation remains for high pressure to be around more often than not in December, so conditions often settled and calm. Though you’ll find out more about my winter expectations fairly soon…the seasonal forecast is nearly due.…