Undulatus Asperatus Clouds
Taken by Helio C. Vital on February 28, 2016 @
Saquarema, Brazil
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Camera Used: SONY DSC-HX300
Exposure Time: 1/4
Aperture: f/3.5
ISO: 160
Date Taken: 2016:02:28 18:29:41
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Details:
Sometimes a passing storm can trigger turbulent convective flows that stir nearby mid-altitude layers of the troposphere in a very peculiar way, producing disturbed cloud patterns that resemble an intricate web of interconnected honeycomb cells woven across a roughly undulating fabric, like a huge vibrating membrane excited at a multitude of points due to a fortuitous combination of weather and landscape conditions. The dark clouds of menacing appearance it includes, first named in 2009 as Undulatus asperatus, usually announce thunderstorms that never come. Nightfall was in progress when I noticed such interesting formations, rapidly approaching from the north (last image in the sequence). Using a Sony DSC-HX300 camera at 22:19-22:28 UT, I could get some images as they passed almost overhead, heading for the Southern Atlantic off the coast of Rio de Janeiro State, some 50 km East of downtown Rio.
Photographer's website:
http://https://www.flickr.com/photos/98669508@N03/
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