So the heatwave in Europe right now is caused by a phenomenon called a heat dome. It's a huge area of high atmospheric pressure, which has enough influence that it forces the Jet Stream to divert around it. The unusual Jet Stream behaviour is drawing hot air North from the Sahara, which is making Europe so abnormally hot.
Apparently, some meteorologists nickname this an omega block, because it blocks off the Jet Stream and pulls it into kind of a Ω shape.
@InvaderXan interesting ... although it seems it's not so unusual anymore
@numimyon Yeah, global warming's making the Jet Stream all messy. 😕
@InvaderXan Jet Stream, Gulf Stream, anything ... but nobody cares. No that's not right, but the people in power don't care. It makes me so sad :/
@InvaderXan Please tell me that it can't be climate change, because I can't cope anymore.
@giantessgnostic I'm afraid that's exactly what causes these things...
@InvaderXan I was hoping not to hear that...
@giantessgnostic Some of us scientists are working on that. As long as the governments keep giving us funding so we can also afford to eat food and live in houses, anyway.
@InvaderXan ...You say "omega block," but I immediately went to:
@Alexis extremely same
@InvaderXan do you know if this pattern the omega one, is here to stay in that shape.
Or if it is a snapshot of now and that it will change some more, as in this is more of a transition to somethig else.
(If the answer is too complicated, it is fine to just say so and leave it there)
Fascinating and scary too, thanks for sharing
@kyzh Honestly, I'm not a meteorologist so I can't guarantee how accurate my answer may be.
I do know that heat domes are persistent but temporary, but I don't know what causes them to form and if there may be something causing them to form more frequently in the future. Weather systems are complex and interconnected. It may be impossible to predict, for all I know.
@InvaderXan I thought they just called it the omega dome because it sounds badass?
I'm gonna call this the shrug block because
@InvaderXan oof, that omega block is a hell of a move, gotta get your zoning right if you want to land those meaties, uh something something FGC slang
ᶦˢ ᵗʰᶦˢ ʷᵒʳᵏᶦⁿᵍ
@InvaderXan Do you know if this is temporary?
@samftblaetr This one is persistent but temporary. Though I have no idea how likely it is for another one to form.
@InvaderXan looks like a shruggie to me ¯\_(ツ)_/¯
@InvaderXan Do we know what causes these high pressure areas in this instance?
@mgr Earth’s atmosphere always has high and low pressure regions (called anticyclones and depressions, respectively, by meteorologists). Though I’m not sure if a heat dome is just an unusually large one or there’s some other formation mechanism behind it. I should try and find out, when I have a minute.
@InvaderXan Oh, okay. It sounded like you made a relation to human-made climate change in the thread. The wikipedia article just says “that’s a thing that can happen”, but this instance above Europe seems pretty unusual.
I’ll try to find out, too.
@InvaderXan Hm, sounds like we can not really know :/
>However, it is impossible to attribute a particular event to climate change.
> The key components of a heatwave are the flow patterns on a continental-scale, and whether the frequency of these patterns will be significantly changed in an altered climate is still uncertain. As such, it is an important and interesting topic of debate among scientists.
https://www.iflscience.com/environment/omega-shaped-jet-stream-responsible-europe-s-heatwave/ IFLScience says it’s hard to attribute.
@InvaderXan ...although it sounds like we made it worse.
> All weather is now occurring in an atmosphere that has been substantially altered by human activities, particularly the addition of large quantities of carbon dioxide, methane and other greenhouse gases from burning fossil fuels and land use change.
> Climate studies have consistently shown that heat waves are becoming more common, severe and longer-lasting as the global average surface temperature warms.
extreme weather and climate change
@mgr Well I mean, this is not a normal occurrence. Don't get me wrong, all indications suggest that the continuing and increasing heatwaves are most certainly an effect of anthropogenic climate change.
What I meant was that I don't know enough to say precisely what physical mechanisms may be causing this right now, because I'm not a meteorologist. Though I'd guess it's all related to global warming throwing weather systems into disarray. The same kind of effect which has been causing the steadily worsening polar vortices over North America (also due to Jet Stream instabilities).
It's all about correlation. Yes, many things *can* spontaneously just happen. Taken individually, they'd just be considered improbable but normal, like abnormal weather historically was.
But when you find things like these happening consistently, in many places all at once, that's a correlation. It cannot simply be dismissed as a statistical outlier.
If you see what I mean.
extreme weather and climate change
@InvaderXan That’s the understanding I got from the articles as well. I just assumed there was a more obvious or direct link to climate change than can actually be proven.
I also tend to overthink things like these in conversations. Sorry about that.
Still thank you for your extensive and comprehensible answer! :)
@InvaderXan that looks like the character 😬
@InvaderXan fascinating and scary in equal measure
@InvaderXan it also looks sort of like lower case omega
@InvaderXan that’s not completely fucking ominous or anything, like at all.
@InvaderXan are you telling me we had a chance to say "Europe is suffering under the effects of a major OMEGA BLOCK" and be scientifically accurate!?
@Eldritch_Horrorgirl Yes, and you should totally start telling people that :P
@InvaderXan A giant omega over Europe. Darkseid isn't exactly subtle, is he?
@InvaderXan thanks for your explanation
@InvaderXan It looks also like the same pattern is extending through Asia and delivering some mighty weather to Japan...
(Other places, too, just Japan's a personal favorite.)
Similar happened with the polar vortex, I thought - patterns "locked" into place.
@OldBrushNewPaper Oh, that's interesting. I didn't realise there was something similar over Asia right now. Though with the increase in extreme weather patterns, it's sadly unsurprising...
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