markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Good grief 🫠

Up at 04:30 this morning to take my wife to the station & thence the airport for an early flight to Edinburgh, to help our daughter again in her post broken kneecap surgery recovery 🤕🩼

If you know me & my night owl habits, you’ll know how much fun that was 😬✌️

So have some pre-dawn clouds: I’m going back to bed 🤷‍♂️

🇳🇱
📷
☁️

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

It may lack the mighty rock formations of Yosemite, but you have to think that Ansel Adams would nevertheless have enjoyed photographing the wide open landscape of The Netherlands & the endlessly changing skies above it 🤷‍♂️🙂

Another picture from yesterday’s 67km ride.

#CyclingLife 🚴‍♂️
#Nederlands 🇳🇱
#Netherlands 🇳🇱
#Photography 📷
#BlackAndWhite ⚫️⚪️
#TheTreeAtGelderswoude 🌳
#CloudAppreciationSociety ☁️

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

I would love to tell you that the game of chicken I played to maximise the length of my ride before this storm arrived ended well 😬

Instead I get to tell you that riding for 2km in hail is, well, enervating 🤪

The other 65km were just fine though & now it’s pissing it down outside 🤷‍♂️

#CyclingLife 🚴‍♂️
#Netherlands 🇳🇱
#Photography 📷
#HeavyWeather ⛈️
#CloudAppreciationSociety ☁️

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Morning.

A front moving from the south & promising heavy rain in about four hours brings some high clouds in too, making a nice 22° ice halo for a few minutes.

Need to get my cycle ride in before the rain comes, I think 😬🤞

🚴‍♂️
🚀 (if you know, you know)
🇳🇱
📷
🌈
☁️

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Brrr 🥶

That strong northerly wind really is keeping the temperatures down & also continues to bring showers in off the sea 🌦️

This photo near sunset during today’s 54km might be a teensy weensy bit overprocessed, but you get the idea 🤪

#CyclingLife 🚴‍♂️
#Netherlands 🇳🇱
#Photography 📷
#TheTreeAtGelderswoude 🌳
#CloudAppreciationSociety ☁️

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

“Where the clouds are made of candy floss”
– Jacky, “White Horses”, 1968

Somehow this song & the associated Yugoslav-German TV series came to mind from my early childhood as the sky was filled with mares’ tails this morning 🙂🤷‍♂️

👴

🇳🇱
📷
☁️

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

65km of semi-successful shower dodging this evening 🌦️🌈😬✌️

And very cold, icy showers they were too, coming from the north as I rode up through the tulip fields towards Vogelenzang.

Most of the flowers are gone now, the stalks beheaded to leave the bulbs ready for harvesting later 💐💡

But there are a few left … 🙂

🚴‍♂️
🇳🇱
📷
☁️

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Dayglo halo 🌞

A lovely long-lasting 22° halo around the Sun due to ice in cirrus high in the sky over Wassenaar today, nicely set off by some passing low clouds 🙂👍

🇳🇱
📷
🌈
⛅️

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Last night's sunset had some spectacular colours, but as a physics & cloud nerd, something else caught my attention 👀

Close to the horizon, there was an obvious semi-sinusoidal wave-like structure ∿∿∿

Very likely due to the Kelvin-Helmholtz instability between two atmospheric layers moving at different speeds, leading to fluctus clouds 🌊🌊🌊

At least 10 peaks & troughs can be seen 🙂👍

🚴‍♂️
🇳🇱
📷
☁️

The same as the first picture, but now with a series of 13 white arrows indicating the individual waves in the Kelvin-Helmholtz train. There is also an annotation reading: "A possible Kelvin-Helmholtz wave train seen over the Barrepolder near Leiden just after sunset, at 20:37 CEST on 07 April 2024 Photograph: Mark McCaughrean"

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Another 52km this evening for 227km this week, best of the year so far 🙂👍

Spoiled for choice picture-wise, thanks to some spectacular cloudscapes as a front moved up from the southwest ☁️

Here’s one at sunset in the Vlietland – more to follow tomorrow, including a curious wave formation 😉

🚴‍♂️
🇳🇱
📷
⛅️

hesgen, to Colorado
@hesgen@qoto.org avatar
markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Dodging the showers coming in on a cold wind off the North Sea during this evening’s 44km ride 💨🌧️

Made for some pretty clouds around sunset out in the Vlietland 🙂👍

🚴‍♂️
🇳🇱
📷
🌳
☁️

Heliograph, to random
@Heliograph@mastodon.au avatar
markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

The Netherlands is famously a windy country, but it has been relentless this week 😱

A chunky 46km ride around the Vlietland this evening, with a decent sunset east of Leiden to lighten the grind 🤷‍♂️

🚴‍♂️
🇳🇱
📷
☁️

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Parallel lines.

Some high drama above the garden earlier this morning. After last night’s strong winds & rain, clearing skies & sunshine are most welcome.

💁‍♀️
🇳🇱
📷
☁️

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Apologies for posting endlessly on this topic, but , here's another shot of the beautiful circumzenithal arc that graced the icy skies above our house yesterday.

This one was taken with my DSLR rather than my phone, so arguably better quality & thus worth uploading.






markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

And here's another view of this afternoon's circumzenithal arc, which is formed by flat, oriented hexagonal ice crystals.

Although fainter than in the picture I posted earlier, the arc subtends over 90º here, which is pretty large.

https://old.atoptics.co.uk/halo/cza.htm






markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Here's that "mystery" ice halo from earlier today, soon after the circumzenithal arc disappeared – a short, colourful arc WNW of the Sun & concave to it.

I've measured it carefully using a later image of a sundog to calibrate the camera FOV) & it is 50º from the Sun.

That very likely means it's a fragment of a supralateral arc, formed in hexagonal ice columns.

https://old.atoptics.co.uk/halo/supinf.htm






An annotated version of the image of a partly cloudy sky seen over our garden this afternoon, with high cirrus ice clouds & some contrails running from bottom right to top right. The Sun is in the lower-left corner & there is a short rainbow-like ice halo visible towards the centre right. There are circles centred on the Sun from 5 degrees to 70 degrees, with the supralateral arc also marked.

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Always unexpected 😱 always breathtaking 🥰

A beautiful circumzenithal arc graced the cirrusy skies over our back garden this afternoon, perhaps one of the best I’ve ever seen.

Often called an “upside rainbow”, you need to look high in the sky to see it – many people miss them on the rare occasions they appear.






markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

New year, pretty sky.

🇳🇱
📷
☁️

atrombone, to transit

The sky above the station was on point tonight. :)

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Chunky weather out there today, with high winds & occasional hail showers 😬✌️

🇳🇱
📷
🌦️

markmccaughrean, to Netherlands
@markmccaughrean@mastodon.social avatar

Unreliable cycling weather 😬✌️


🇳🇱
📷
🌦️

glasspusher, to random
@glasspusher@beige.party avatar

@TidalFlats @edwilk @12thRITS @AlterNewt @keithmorrisnm @Biff52

Sunrise here at Casa Vidrio, in between rain bands.

glasspusher, to random
@glasspusher@beige.party avatar

@TidalFlats high clouds here before sunrise, created a nice bit of color off of my back deck

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