The Spinning Twins and Bad British Weather

Met Office photo depicting twin low pressure zones locked together over the UK and Europe

Something interesting is happening in our skies.

It may not look like much from down here, where all we can see is a seemingly-endless sheet of stratocumulus, but way up there, a very strange pattern has taken shape.

The What.

Usually our British weather undergoes the following kind of pattern: a single spiral of low-pressure air sweeps in from the sea, usually from Iceland or the Gulf Stream ways, giving us rainy, ‘miserable’ weather. Then a spiral of high-pressure air moves up from Western Europe to give us more amiable weather. We alternate between the two. Which is why Britain is often rainy, with short breaks. Pretty simple.

But since last week, something interesting happened. A low pressure spiral of air passed over the UK – and got stuck. Another low pressure spiral joined it but did not move it completely out of position. Instead the spiral movements of the air sort of provided reinforcement for each other – a positive reinforcement cycle – and kept each other circulating over the same patch of land, namely, Britain and North-Western Europe.

There was even a point on the Met Office charts for late Wednesday night which showed three low pressure zones together over the UK!

While it’s not the weirdest thing in the world for there to be more than one low pressure zone in a weather pattern, it is strange for these zones to maintain each others’ presence in the same location for such a long period of time! It’s been a week now, and the charts indicate it’ll be at least another week before they manage to shift.

Check out the Met Office’s surface pressure animation for the next few days and you’ll see what I mean more clearly.

The Why.

The UK sits at the forefront of the battleground between cold polar air and warmer subtropical air. The line drawn between the two is called the Jet Stream; you’ve probably heard of this thing before in the news every so often.

Well, something the Jet Stream does is it undergoes these oscillations: wave-like patterns which make it change position. You might have heard of the North Atlantic Oscillation (hint: it’s also the name of a band) but what we’re going to focus on here is the Arctic Oscillation. Now, when the oscillation is in one phase, the Jet Stream may be located further up to the north of Scotland, drawing up warmer air over most of Britain; when the oscillation is in another phase it may be located closer to London, pushing down polar air over most of Britain.

A positive oscillation pattern is ideal – this basically means the waves in the Jet Stream are low, so it’s a lot calmer and more like a straight line, and weather is more regular. A negative oscillation is not so good. This means that the waves are much bigger in scale, so the undulations are a lot deeper and weather is more chaotic.

At the moment we’ve got what we call a neutral oscillation – which is not ‘no oscillation at all’, as you may think the name implies, but rather means it’s mid-way between positive and negative. And it’s been trending more and more towards the negative over the past decade.

This set of spinning twins is an example of this in action. The Jet Stream’s effectively turned into a Big Dipper, and a couple of low pressure zones have gotten entangled in one of the dips – right over our heads here in the UK. Lucky Britain, eh?

The Bad.

We should be operating under warmer weather more typical of British Summer Time now – and we did experience a nice unusual warm period almost a month ago now. Remember those numerous cloudless days before all this bad weather kicked off? Again, this was due to part of these natural oscillations, in which the waves were placed so that warm, high pressure Mediterranean air got ‘stuck’ over our heads for almost a week (but you never hear talk of oscillations when the weather’s good).

That warm period was a boon for plant life, and now plants seem to be suffering from this unexpected cold in many regions. Especially after another cold winter , the poor things aren’t doing too well! Same goes for animals – lamb birthing etc.

And of course, rain tends to ruin people’s outdoor plans! It’s not nice either for those with arthritis or something similar. Time to bring out the warm socks again in many cases!

The Good.

It’s probably time to admit that this is one of my favourite kinds of weather. With low pressure zones, especially when it’s got a good old combination of cold, warm and occluded fronts all bundled up together, you get a huge variety of clouds. It’s a cloud smorgasbord. Every day I have been able to revel in an array of dramatic cloudscapes, from the puffiest of cumulus towering in intensely sunlit skies, to wispy cirrus preceding walls of blanket-grey stratus clouds. Bands of rain that sweep over in only a couple of hours or even minutes, allowing you to gaze upon the raincloud leaving, with fibrous, veiled tendrils of rain trailing beneath it like some sacred shroud. Unexpected rainbows against cauliflower backdrops, huge anvil nimbuses with mammatus udders, the strangest shades of blue at sunset.

Anvil headed nimbus cloud with mammatus 'udders' hanging beneath

Anvil headed nimbus cloud with mammatus ‘udders’ hanging beneath

Strange blue skies at sunset against a creamy cloud backdrop

Strange blue skies at sunset against a creamy cloud backdrop

Storm cloud trailing virga, or wisps of rain, beneath it

Storm cloud trailing virga, or wisps of rain, beneath it

A grand cumulonimbus capillatus incus over South London

A grand cumulonimbus capillatus incus over South London

Dramatic cumulus cloudscape

Dramatic cumulus cloudscape

A natural cloud stripe

A natural cloud stripe

 

 

It’s beautiful.

If you need some more convincing, just check out this luscious slideshow from the BBC, displaying recent lenticular clouds over Yorkshire.

So it’s hard to tell how long it’s going to stay like this, but it isn’t forever. If anything, when the next high moves in, we will enjoy and appreciate it all the more.

 

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The Ol’ Trigger Warning Switcheroo.

I’ve taken a less conventional approach towards Blogging Against Disablism Day. Hooray! It’s about trigger warnings, so naturally there’s some mention of traumatic stuffs, but not in too much detail. Please stick with it, there is some science at the end.

A guest article by the one and only Hetty Garbagegurgler. Hetty is a satirical caricature from an alternate version of reality which shows some strange opposites yet some scary parallels to our own. To be read in an accent of as much faux-outrage as possible:

With PTSD, we know that exposure to certain triggers can lead to breakdowns and loss of an entire afternoon, or maybe even days of work. This is a serious thing but luckily in the world we live in, this is always taken into consideration in the media.

However, does this concept of triggers really stand up to scrutiny when we think about, say, food allergies? I mean, sure there have been studies done on it and such, but this is an opinion piece and I can’t be bothered to go and hunt for them. And without any studies to point to, at least this humble blogger can’t be accused of confirmation bias, right?

Let’s look at this in more detail. What is a trigger? According to the Collins English Dictionary, when not talking about the obvious firearms, a trigger is any event that sets a course of action in motion. When we’re talking about illness or disability it usually has negative connotations.

People with allergies often claim that they are affected by triggers as much as those with mental disabilities. I know, it sounds weird, right? We all know that specific, intense depictions of a traumatic event (such as a sexual assault) can affect PTSD sufferers severely, causing symptoms such as dissociative fugue states where they end up halfway across the country with no memory of how they got there, self-destructive behaviour such as excessive drinking or self-harming, or maybe even loss of memory. And these things are serious enough that they can make people lose their jobs. That’s like, common knowledge. That’s why we have the usual media warnings around such depictions.

But apparently certain types of food can cause people to feel ill, or go into something called anaphylactic shock. This is not as widely known as the intricate workings of the mind, and quite frankly, it is hard to believe. Some people claim that having an allergic episode, especially anaphylactic shock, affects their ability to work.

Hang on just one second. In the world we live in, mental health conditions are obvious and we must make people aware of unexpected triggers that can severely debilitate their daily functioning, but the idea that we should extend this to the less obvious and, frankly, overreactionary, physical health conditions is just ridiculous. I mean, I know we get a lot of people with such allergies tell us personally what kind of things are likely to trigger an episode, but how are we to really ever know? Does it mean we have to get trigger-happy with food packaging? Just think how terrible it would be if every food item’s packaging design had to be interrupted with annoying messages about how it contains egg or nuts!

We don’t want to end up in a world where people care more about their physical health than other peoples’ enjoyment, do we?

Or at least, all of this is what I would say if I wasn’t willing to consider the real complexities behind any kind of health condition. Luckily this has all been satire up until this point, so I actually think that both physical and mental health conditions should be taken into consideration whenever someone’s interacting in the media in a meaningful way. It’s a concept called accessibility, and it is a good idea to pay it some more attention.

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It’s Blogging Against Disablism Day today, and my contribution came about from the recognition that certain mental conditions and disabilities (for example PTSD) are often treated as an afterthought, and in many cases even more so than other forms of disability. I deal with a lot of accessibility work in my day job, and it’s hard enough convincing people just of the need to make something accessible for a blind person, let alone people with mental health conditions. I don’t like the idea that an active choice I make to not include accessibility information could needlessly make life more difficult for someone. If given the choice between mildly irritating someone who doesn’t like the fact I’ve included a warning, and causing a full mental breakdown/substance abuse relapse of a person recovering from a serious assault or time spent in a war zone, I’d rather mildly irritate someone.

You never know exactly who your audience will be, and saying ‘well blind people will probably not visit my website so I won’t bother making it screen reader friendly’ is as useful as setting up a restaurant and saying ‘Well it’s incredibly unlikely that someone with a nut allergy is going to come here, so I’m not going to even mention if something’s been prepared near nuts.’

And also it was fun to imagine a world in which people with mental conditions were treated with respect, but the downside being that a physical condition was given the current status that many mental conditions have. I’m kinda hoping for a world where both are treated seriously and with respect owing to the varying natures to which different people experience their disabilities.

Here’s some links and useful articles which talk a bit more about PTSD, if you want to know more:

 A bit more about the science side of it:

You’ll note I’ve linked to a lot of psychology articles. This is mostly to help make people aware that psychological trauma triggers are very real, and vary from person to person. There is some evidence in these papers that suggest trigger avoidance is not a good thing overall, which I accept, but there was also plenty to suggest that exposing people to triggers has a less detrimental effect if steps have been taken to make an environment feel safe.

I found little evidence of how best to approach the subject of trigger warnings in such a newly born environment as online social networking (which is what I am really interested in). The conventional trigger warning notices for major identified trigger topics such as sexual abuse or suicide seemed to do pretty well for the many mental health forums and communities that have persisted throughout the past couple of decades, but with increasing exposure of the wider online community to this terminology it’s probably a good area to research a bit more in future. My foremost concern is in how to provide effective accessibility measures, so I’ll certainly be keeping track of any developments in the area.

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Walking with Dinosaurs!

Last week was the Birmingham premiere of the best show currently touring the UK right now – Walking With Dinosaurs!

In a word, it was AWESOME!

The T-rex below, for example, actually had me a bit scared! The sound, man… Way more intense than watching Jurassic Park in 3D.

ahmagadtrex

Not only were the dinosaurs incredibly textured and well-done that they really did look alive, but they were huge, and it was only at points where I noticed the paleontologist running around beneath them ‘for scale’ that I really became aware of the size of them. The brachiosaur was astonishing.

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First off all they brought out a ‘baby’ brachiosaur, and I thought initially that this was their way of managing to avoid making a huge adult-size brachiosaur puppet, but only five minutes later, after the allosaur had given the baby a bit of grief, the paleontologist turned around to a loud booming behind the curtain.

‘What could that be? Looks like the baby’s mother is coming out to defend it…’

And a head emerged from behind the curtain. The brachiosaur had to bend to get out, and when it extended its neck fully it near reached the highest lights in the stadium.

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The rocks on the stage moved around and became smoking volcanoes to symbolise the Deccan Traps as the paleontologist explained the role of flood basalts in the extinction of the dinosaurs.

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Flowers popped up from the ground as the paleontologist explained that flowering plants developed much later than dinosaurs evolved.

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There was a lot of meaty info, which was great for the kids in the audience, and makes me one very happy geologist. So seriously, if you have kids, or if you’re just overly enthusiastic about dinosaurs this is well worth a watch, and a great way to spend the evening!

(In fact, @thegeologyshop and I were so thrilled we got dino balloons afterwards… as you do…)

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