Big feather in the sky........

Jonny · #1 (**permalink**) 26-08-2006, 08:46 PM

Can anyone explain what this is all about, there was a couple of these feather like clouds in the sky at the time........

Tormentil · #2 (**permalink**) 26-08-2006, 08:46 PM

Que ??

Alan · #3 (**permalink**) 26-08-2006, 08:50 PM

Quote:

Originally Posted by Tormentil

Que ??

Na if it was Que he'd put two eyes above it!

Maybe an aeroplane vapourtrail as it hit a very cold air stream?

eeyore · #4 (**permalink**) 26-08-2006, 08:50 PM

I would have said that that was a dispersing contrail from a jet - but i could be wrong.

henrya · #5 (**permalink**) 29-08-2006, 09:19 AM

Looks like a fallstreak to me - a bit complicated to explain but it's all to do with supercooling and ice crystals, I think the feather is composed of ice crystals formed from the supercooled cirrus vapour that surrounds it. Note the clear space round the feather where the vapour has aggregated. See the weather gallery for a photo of a much more pronounced example where the hole is much more obvious and well defined. (I might be wrong about this as I stlll don't fully understand the process!).

henrya

smartie · #6 (**permalink**) 29-08-2006, 11:01 AM

This looked interesting, so I thought I'd look up fallstreak and see if I could understand what it was. I found out that "A precipitation fallstreak is a manifestation of an inhomogeneity in the mycrophysical structure of the storm." So that clears that up nicely, then!

Excuse me, I'm off for a lie down now...

smartie · #7 (**permalink**) 29-08-2006, 12:48 PM

Afraid I can't - all Greek to me. And you'll have noticed I can't even spell it in English - should of course say "microphysical".

Thanks for the welcome. I'm learning a lot - though not about fallstreaks

jennyb · #8 (**permalink**) 29-08-2006, 01:23 PM

Quote:

Originally Posted by smartie

This looked interesting, so I thought I'd look up fallstreak and see if I could understand what it was. I found out that "A precipitation fallstreak is a manifestation of an inhomogeneity in the mycrophysical structure of the storm." So that clears that up nicely, then!

Excuse me, I'm off for a lie down now...

I preferred Henrya's explanation

Jenny

Jonny · #9 (**permalink**) 29-08-2006, 02:47 PM

Quote:

Originally Posted by henrya

Looks like a fallstreak to me - a bit complicated to explain but it's all to do with supercooling and ice crystals, I think the feather is composed of ice crystals formed from the supercooled cirrus vapour that surrounds it. Note the clear space round the feather where the vapour has aggregated. See the weather gallery for a photo of a much more pronounced example where the hole is much more obvious and well defined. (I might be wrong about this as I stlll don't fully understand the process!).

henrya

Well done Henrya........I asked a weatherman friend what it was and he confirmed what you said.......

That sir is a Fallstreak Hole in cirrocumulus and is common.

The cirrus cloud under the center of the hole gives us a clue to what is happening. Cirrocumulus cloud is made up of super cooled water droplets if they freeze they drop out of the bottom.

If there had been virga forming under the hole or the hole was clear of cloud it would have suggested ice crystals are falling through the cirrocumulus from higher up

I am still none the wiser, but I now have a name for it. Cheers for all the replys..........

henrya · #10 (**permalink**) 29-08-2006, 03:19 PM

Quote
That sir is a Fallstreak Hole in cirrocumulus and is common
Endquote

But I've been looking for one for the last three months and haven't seen one - maybe I 'll have to spend less time in front of this computer thing!

Anybody want an explanation of supercooling?

henrya

jezlee · #11 (**permalink**) 29-08-2006, 03:41 PM

Quote:

Originally Posted by henrya

Anybody want an explanation of supercooling?

henrya

Go on then, I'm game ....

eeyore · #12 (**permalink**) 29-08-2006, 08:33 PM

first sit in your fridge - ensuring you keep the door open ....

Lerom · #13 (**permalink**) 01-09-2006, 06:18 PM

I wonder if this might be of any interest to you. I read this fascinating thread and it looks very much like some of those on the link.

http://www.schools.ash.org.au/paa2/m...lid=5&fileid=#

.

falco · #14 (**permalink**) 22-09-2006, 11:46 AM

Hi.

It is definitely a FALLSTREAK. They are not uncommon. The cloud in the middle is Cirrus (maybe altocirrus?) For all of you Weather People out there: I read a great book recently called THE CLOUDSPOTTER'S GUIDE. It was one of the best books I've read in recent times. About clouds, as you may have guessed. It catalogued all the cloud types, what they mean, how they form etc. It wasn't too technical or academic either. Definitely worth buying. Anyone interested in Nature will love it. Some great bits in it, esp the chapter about the Fighter Pilot ejecting from his plane at a great height falling through a Cumulonimbus thundercloud (those angry anvil-shaped storm clouds) and being buffeted hither and thither buy thermals and hailstone. He touched ground 45 minutes later. Wow.

Anyone read this book? If so, what did you think??

Regards
Falco

littleT · #15 (**permalink**) 07-10-2006, 10:53 AM

I learn't some of this in geography for my g.c.s.e's
I thought I'd be learning about capitals and maps.
But in amongst agriculture river, lakes and water falls we learn't about different types of clouds. Looks like I'm goig to have to get the old school books out again.
Fasinating subject.

snowdrop · #16 (**permalink**) 20-10-2006, 07:10 PM

I get these above my home on a daily basis.
Its a chemtrail. Planes 'seed' the sky to induce rain. The feathering effect is brought about by atmospheric winds.
There are grumblings from the public concerning health worries due to the mixture of chemicals used.
Considering the frequency of 'seeding' (I counted 19 in a three hour period one morning) I am surprised they were not recognised right away.
Perhaps you live in chemtrail-free areas?
You lucky people....(smile)

henrya · #17 (**permalink**) 23-10-2006, 09:17 AM

snowdrop, we don't, as far as I am aware, have cloud-seeding in Britain. This is not a chem-trail, though I've no doubt they look much like this picture. It's a purelu physical phenomenon.

henrya

snowdrop · #18 (**permalink**) 30-10-2006, 07:21 PM

It was not my intention to mislead you or any of the folks on this forum henrya. What would be the point of that?
The 'seeding' of British skies IS fact. Dont take my word for it....check it out on the net.

Its a pity I dont own a camera or have the know-how on posting pictures, but hey, technology is for the young 'uns. At my age I,m just happy with the ability to post on a forum.

henrya · #19 (**permalink**) 31-10-2006, 11:04 AM

snowdrop, I wasn't accusing you of misleading anyone, I just assumed that you were from somewhere outside Britain. As I said, I wasn't aware of cloud seeding happening in Britain - perhaps you can point me to some information on it. But the picture we are talking about is very unlikely to be a chemtrail as the clouds surrounding it are not clouds that would produce rain.

henrya

eeyore · #20 (**permalink**) 31-10-2006, 09:34 PM

i cant find anything on the net to suggest there is seeding in the uk now - found this refering to seeding in 1952 tho

EDIT : doh here it is BBC NEWS | UK | Rain-making link to killer floods

snowdrop · #21 (**permalink**) 01-11-2006, 01:00 PM

I did a small search of the net this morning Eeyore and found a couple of sites. Googlepolice chemtrails in england. (youtube have some good vids)........and chemtrails wales uk.

Interesting point about the clouds surrounding the feather henrya. When I look at them they remind me of a white 'Giants Causeway'. But I,m just a soppy romantic. (smile)

eeyore · #22 (**permalink**) 01-11-2006, 02:35 PM

Quote:

Originally Posted by snowdrop

I did a small search of the net this morning Eeyore and found a couple of sites. Googlepolice chemtrails in england. (youtube have some good vids)........and chemtrails wales uk.

No offence intended but none of those sites are exactly what you could call reliable , most also featuring ufo sightings, conspiracy theorems, and other bizarre fantasies.

Just because it is mentioned on the net doesnt make it a fact, as one of the joys of the net is that anybody can write anything on a website and publish it in cyberspace.

Most of the "chemtrails" photographed look to me to actually be perfectly normal contrails from jets.

Of course it could be that a sinister government conspiracy known only to a shadowy figure known as mr x has designed their chem trail seeding to look like innocent contrails

but it will take rather more reliable evidence to convince me of that

Paul mabbott · #23 (**permalink**) 01-11-2006, 04:17 PM

Yes, there were trials in the 50-60s but abandoned as unreliable in many ways. Especially of little use on cloudless sunny days during droughts!

Quote:

Originally Posted by eeyore

i cant find anything on the net to suggest there is seeding in the uk now - found this refering to seeding in 1952 tho

BBC NEWS | UK | Rain-making link to killer floods

snowdrop · #24 (**permalink**) 02-11-2006, 02:46 PM

I hear you Eeyore. But as I said, I only made a small search (as I,m busy decorating for Christmas. You would't believe how long it takes me these days.)
I've just glanced at them now and noted the ufo groups mentioned.

Chemtrails first came to my notice on a documentary about global warming broadcast on Sky.
It covered the gulf stream, the sun,volcano's etc. One group of scientists discovered a connection with chemtrails. It seems that when the Usa airports where at a standstill after 911, the climatic temperature rose at least one degree. They realised the trails were actually helping to keep the ground temperatures down. After much discussion the group feeling was...we are in trouble if we keep it up...and we are in trouble if we stop.

I've looked skywards ever since. I have found the difference between contrails and chemtrails is...chemtrails stay around long after contrails have disappeared from the sky.

It is your right to disagree.... as it should be. (back to the painting. OH, Hum.)

Big feather in the sky........

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