A volcano blows up the Pacific two days ago. This is is the sky at dawn over the east coast of the Highlands this morning.

17 comments
  1. All I got from the comments is that OP is thick as shit, but scared to lose face. Yes volcanic eruptions can cause a sky similar to this, no this one didn’t have anything to do with the volcanic eruption. Nobody is arguing the general phenomena, they’re arguing this specific picture.

  2. Lol the absolute pantomime going on in these comments.

    Sometimes OP, you just have to hold your hands up and admit you’re wrong…

    And cool photo, its a nice sky.

  3. Geologist here.

    Nice picture. Ash clouds can cause beautiful sunrises and sunsets as the ash affects light scattering in the atmosphere. Anecdotal, but the vivid sunsets seen in some Turner paintings are thought to have been linked to the 1883 Krakatoa eruption.

    The ash from Tonga, however, is not having any effect on the UK though. Tonga is about as far away from the UK as it’s possible to get. Average wind speed is very roughly 9 mph. I’m on my phone, but it wouldn’t be difficult to calculate and come up with an extremely rough estimate for how long it would take ash travelling in a straight line on the wind from Tonga to Britain. It will be longer than two days.

    Then there are so many complicating factors, because wind doesn’t travel in straight lines. It travels in atmospheric cells – there are six of them (Hadley, Ferrell and polar cells each side of the equator). Air can move between these cells through things like jet streams (which can move very fast), but they tend to move west to east rather than south to north. You’ve also got to get that ash high enough into the atmosphere to get picked up by these currents. A quick bit if googling suggests that the ash column isn’t that high in Tonga.

    Nice sunsets can happen without volcanic ash. Ice particles, for example. At this time of year the sun is low in the sky and it’s the red spectrum of visible light (which has the longest wavelength) breaks through the atmosphere to give us those vivid colours. The shorter wavelengths (like blue) get scattered by things like ice high in the atmosphere.

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