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Deme

@ Deme @lemmy.world

Posts
41
Comments
57
Joined
3 yr. ago

Interested in weather, meteorology and photography. Aviation weather observer.

Other account: @Deme@sopuli.xyz

  • Peak urbanism: The wilder cousin of the grassy tram

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  • Grass would be more of a hassle. Once the plants have properly rooted down, the tracks shouldn't need any watering or routine cutting. I'm guessing that the trams themselves prevent most of the plants from growing too long. As can be seen in the first picture there, the plants between the rails are shorter than those between and outside the two tracks.

  • 🐸 time

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  • An extreme value is always only extreme in relation to some baseline. For temperatures it's usually a value that departs far from the local average. With WBT it can also mean values that approach the limit of what the human physiology can handle, a value that is quite universal due to us all being of the same species. The body cannot adapt beyond the limits set by thermodynamics.

    Tropical and extreme aren't mutually exclusive. +30°C in Antarctica would be both tropical and extreme. Both are used where applicable. A temperature can also be extreme without being tropical. No matter what Trump thinks, he doesn't have the power to redefine (let alone erase) words.

    The wet bulb temp. in a proper sauna should get quite high, I don't have exact numbers but above 70°C or so (dry temp. 90°C, relative humidity 50% would translate to a WBT of 74°C). In most contexts that would be extreme, but not here.

  • 🐸 time

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  • *Extreme WBT's

    A wet bulb thermometer measures wet bulb temperature (WBT), which is a metric that always exists and can always be measured. It only gets bad when the WBT reaches an extreme value, as is the case for basically all environmental metrics. Saying that wet bulb temperature is lethal is like saying that temperature is lethal. Look out for temperature! I'm sorry for the rant so I'll try to keep this short, but "wet bulb" by itself in this context is an inane shorthand that lacks all the significant words and muddles the meaning of those words that are in it. Scientists talk about Extreme WBT events, because that's what they are. A less of a mouthful would be nice for science communication, but I don't want it to come at the expense of words losing meaning like that.

    Heatwave is a nice and descriptive word for one type of an extreme temperature event. Cold snap is another one. I'm glad neither is called "temperature event" because that would be dumb.

  • Saw these grid clouds yesterday [OC]

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  • Nice! Altocumulus stratiformis undulatus, but with two intersecting systems of undulations. Think of them like cross waves at sea.

  • 196 @lemmy.blahaj.zone
    Deme @lemmy.world

    Various rules

  • Decoding a METAR - XKCD

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  • I had to do a double take when I first saw that "RASH" in the comment above. Is there a place where it's written like that instead of just SHRA or was that just a joke? Generally the pattern is always [intensity][descriptive attribute][phenomena], but the US system has so many deviations from the international standards that I can't be certain.

  • Aviation @lemmy.world
    Deme @lemmy.world

    Decoding a METAR - XKCD

    xkcd.com /3024
  • aviation @lemmy.ml
    Deme @lemmy.world

    Decoding a METAR - XKCD

    xkcd.com /3024

  • Shallow fog and Cirrus at sunrise today [OC]

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  • Thanks! Time really is the most important ingredient. Look at enough sunsets and sunrises with an adequate camera on hand, and every now and then a great scene will come up. After that it's just point and shoot.

  • pics @lemmy.world
    Deme @lemmy.world
    OC

    Shallow fog and Cirrus at sunrise today

  • Clouds @sh.itjust.works
    Deme @lemmy.world
    OC

    Cirrus, including some Cirrus spissatus at sunrise today

  • pics @lemmy.world
    Deme @lemmy.world
    OC

    Condensation and diffraction

  • Disillusionment [OC]

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  • Thanks!

  • Disillusionment [OC]

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  • Thanks! Yes, it is a photo. The moth was chilling on a window after sunset. The blue dots are out of focus apron lights.

  • pics @lemmy.world
    Deme @lemmy.world
    OC

    Disillusionment

  • Russian satellite breaks up in space, forces ISS astronauts to shelter

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  • They sure don't tend to do that, but there are still mundane explanations for this. An unintentional collision between the satellite and another object being one of them.

    "I find it hard to believe they would use such a big satellite as an ASAT target," McDowell said.

  • Russian satellite breaks up in space, forces ISS astronauts to shelter

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  • Not because of Kessler syndrome, just your run of the mill space debris reentering the atmosphere and increasing the amounts of certain metals up there that contribute to ozone depletion. In other words, that may well happen even if we're lucky and avoid Kessler syndrome.

  • Aurora Borealis last week [OC]

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  • Posio, southern Lapland, Finland

  • More Aurora borealis from last week [OC]

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  • Posio, southern Lapland, Finland

  • pics @lemmy.world
    Deme @lemmy.world
    OC

    More Aurora borealis from last week

  • pics @lemmy.world
    Deme @lemmy.world
    OC

    Aurora Borealis last week

  • Clouds @sh.itjust.works
    Deme @lemmy.world
    OC

    Cirrus uncinus radiatus

  • Clouds @sh.itjust.works
    Deme @lemmy.world
    OC

    Cirrostratus fibratus and a 22° halo

  • Clouds @sh.itjust.works
    Deme @lemmy.world
    OC

    Snow shower

  • Nightless nights of summer [OC]

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  • Almost forgot to get back to you about that last part: Yes it did, but this wasn't that.

    Here's a picture I took when the smoke was making a sunset unusually red:

  • Nightless nights of summer [OC]

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  • Nightless nights of summer [OC]

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  • Nah winters are beautiful up north. Sometimes also in the south, but only rarely around the southern coast.

  • Nightless nights of summer [OC]

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  • Thanks!

  • Nightless nights of summer [OC]

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  • You're welcome!

  • Clouds @sh.itjust.works
    Deme @lemmy.world
    OC

    The most well developed fluctus I've seen. Altocumulus stratiformis fluctus

  • pics @lemmy.world
    Deme @lemmy.world
    OC

    Nightless nights of summer

  • pics @lemmy.world
    Deme @lemmy.world
    OC

    The sunset today was quite something.

  • Clouds @sh.itjust.works
    Deme @lemmy.world
    OC

    Altocumulus with a lot of virga shortly after sunset today

  • aviation @lemmy.ml
    Deme @lemmy.world
    OC

    Dreamliner departing into the sunset

  • aviation @lemmy.ml
    Deme @lemmy.world
    OC

    Taxiing on a summer midnight

  • Shallow fog and sunshine [OC]

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  • Thanks for notifying. Should be fixed now.

  • Shallow fog and sunshine [OC]

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  • Thanks! That day was beautiful.