Jellyfish at the Rypen Clump

Jellyfish at the Rypen Clump

Photo Information
Altocumulus castellanus 'Jellyfish' clouds - gliding over the Rypen Clump, South Devon, on the evening of Midsummer Solstice 2017.

These clouds take their technical name from their resemblance to the turrets of castles and are often a warning of *thunderstorms.

These are formed when a layer of moist air is trapped between two layers of drier air.

This particular 'swarm' of Jellyfish occurred at the end of a multi-day heatwave. Whilst the surface of the earth was being heated by solar radiation, it in turn heated the air above it. This air rises (convection). Rising air, if there is moisture present, creates visible cloud particles and corresponding clouds.

The atmosphere, though, is made up of layers. In the case of Altocumulus Castelanus, there is relatively dry air at the surface and relatively dry air aloft. In the middle, though, there's just enough moisture to produce a cloud.

Essentially, the cloud vaporizes at this height of the atmosphere, thereby stunting the cloud's growth and producing the "dome" portion of the jellyfish cloud.

At the same time, water droplets within the cloud are becoming too heavy to remain suspended in the air. As gravity pulls the water droplets toward the ground, they encounter yet another layer of dry air and evaporate before they can strike the surface of the earth. This phenomenon, known as 'virga', produces the tendril-like streaks in the sky below the altocumulus dome.

* Many violent thunderstorms occurred across the UK, The North Sea into Belgium, Netherlands, Germany & Czech Republic over the following 24hrs after this photograph was made.
22/06/2017 - 22:16morpheus71
CategoryLandscape / Travel
Shutter Speed1/125
Aperturef/8
LensN/A
ISO200
Focal Length18mm

GIULIO57

Link Posted 23/06/2017 - 05:01
Nice work and tech. infos
PPG

morpheus71

Link Posted 23/06/2017 - 16:09
GIULIO57 wrote:
Nice work and tech. infos

Many thanks Giulio 😊 I feel lucky to have seen these rare clouds a few times over the years, the always fascinate me😊
https://www.philhemsley.co.uk/

pauljay

Link Posted 24/06/2017 - 07:41
And it all passed to the west of us, so we are still awaiting our first shower in weeks! Some of the cu-nims were pretty impressive though! A pleasing shot Phil.
Paul.

Photography is not a sport. It has no rules. Everything must be dared and tried! (Bill Brandt)
jaypix
yankee44
PPG

morpheus71

Link Posted 24/06/2017 - 11:36
pauljay wrote:
And it all passed to the west of us, so we are still awaiting our first shower in weeks! Some of the cu-nims were pretty impressive though! A pleasing shot Phil.

Many thanks Paul 😊 Did you photograph any of the cumulonimbus? The lightning radar maps were aglow for many bits of Western Europe over the 24hrs after this photo. Hope you get some soon 😊
https://www.philhemsley.co.uk/

pauljay

Link Posted 24/06/2017 - 12:08
The best time for the Cbs was when my daughter and I took our neighbour's dog for a walk and a splash in a local river, the aim being to keep her paws off the hot roads! Needless to say the only camera I had with me was the phone! However, the cloud view was rather hazy as we, apparently, have a lot of dust in the atmosphere at the present time.
Paul.

Photography is not a sport. It has no rules. Everything must be dared and tried! (Bill Brandt)
jaypix
yankee44
PPG

davidstorm

Link Posted 24/06/2017 - 23:37
A fabulously composed image with equally great narrative, you really do enrich us Phil with both your photographs and your words!

Regards
David
Flickr

Some cameras, some lenses, some bits 'n' bobs

morpheus71

Link Posted 26/06/2017 - 14:39
davidstorm wrote:
A fabulously composed image with equally great narrative, you really do enrich us Phil with both your photographs and your words!

Regards
David

Many thanks for your very generous comments David 😊 It would be great to visit the USA and watch their wonderfully dramatic convective storms evolve. Always fascinating to see how skies change in active weather 😊
https://www.philhemsley.co.uk/
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