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actually this is a little spider pocket left over in the groove on a blue cinder block wall. but it's still a cloud. just a vague one.
“Clouds come floating into my life, no longer to carry rain or usher storm, but to add color to my sunset sky.”
Rabindranath Tagore
I started this picture almost a year ago and forgot about it because I wasn't happy with the result. Yesterday I stumbled across it and decided to change it completely.
Taken from Ecclefechan, Dumfries & Galloway, Scotland.
Nacreous are one of the most beautiful of all cloud formations, but they are also the most destructive to our atmosphere. Their presence encourages the chemical reactions that break down the ozone layer, which acts as an essential shield protecting us from the most harmful of the sun's rays.
Also known as "mother-of-pearl clouds", nacreous clouds exhibit spectacular iridescent pastel colours, caused by the sunlight diffracting as it passes around their tiny ice crystals.
Since they form much higher than common clouds - at altitudes of between 12 and 15 miles - nacreous clouds are most apparent around sunrise and sunset when their colours stand out against the darkened sky. The stratosphere is extremely dry, compared with the cloud-filled lower atmosphere, so the air needs to be very cold indeed for any ice crystals to be able to form there.
Nacreous clouds only appear when stratospheric temperatures are below -83C.
Jackass Bend Unit, Big Muddy National Wildlife Refuge, near Orrick, Missouri. I was oblivious to any tornado threat until the moment before snapping this photo. Immediately after taking this shot, it occurred to me that I was standing in it's path, maybe 200 yards away.
Clouds are such a nice subject for HDRs. HDR from three shots, taken with Canon 450D with Sigma 10-20mm lens, handheld.
Looking south from MacFarlane towards Crossover, with Slesse totally hidden in the clouds behind.
Originally for Where am I In BC
A view out the plane window before taxiing for takeoff from Austin. I found converting to Black & White brought out a nice total contrast in the white's, gray's, and black's of the clouds.