Turn an ocean upside down and the result might look something like this sky. The cloud base rises and falls in dark folds, while the houses below make the scale of the pattern clear.
A name for an unusual appearance
The World Meteorological Organization’s description of asperitas refers to pronounced wave-like structures on a cloud’s underside. It is a useful comparison for this archive scene, rather than proof of every weather process occurring when the photograph was taken.
The original account credited the Nebraska images to the user jebleez and described them as captured rather than fabricated. Without the original files and processing history, that description cannot be independently confirmed.
Shape is not a complete forecast
A dramatic cloud base alone does not tell you exactly what will reach the ground. Use current weather information for decisions. Compare the broader forms in our storm-cloud gallery, or the much smaller atmospheric structures in a rimed snow crystal under a microscope.
Clouds can transform the view from above, too: see our explanation of the Grand Canyon’s cloud inversions.
Cloud shapes, light and the photographic account
The houses beneath the folded cloud base provide a reference that a sky-only crop would lose. The scene can resemble a rough sea because light and shadow emphasise successive waves on the underside. That comparison describes its appearance, not an ocean-like substance above the neighbourhood.
RAW and HDR describe different aspects of making a digital image. A RAW file concerns captured image data, while HDR refers to an approach to tonal range; calling a photograph RAW does not establish that it was never adjusted. The account attributed to jebleez is therefore a source statement rather than a complete processing history. The folded cloud base remains the subject to examine, with the houses providing scale and the WMO description offering a careful comparison for its appearance.
Sources, photography and further reading
Original feature and image attributions:
- jebleez
- source
- Where Cool Things Happen
- These Clouds Are Scary As Hell. Better Bring An Umbrella.
- This Lamp Creates A Thunderstorm In Your Living Room. And It’s Really, Really Cool.
- Beautiful Strange And Rare Cloud Formations
- Lenticular Clouds: The Rare Cloud Formations Look Like Objects From Another World
- World Meteorological Organization’s description of asperitas
- storm-cloud gallery
- a rimed snow crystal under a microscope
- our explanation of the Grand Canyon’s cloud inversions
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