Cumulus mammatus clouds, seen on an April evening from Leeds. Not a particularly fine example, but the best we have at the moment.
Mammatus clouds hang from the underside of a cumulonimbus cloud, and hence are always associated with storms. They indicate great instability in the atmsophere, with many convection currents. To see them well, it's best to have a low, unobscured sun to cast shadows.
Image detailsPhotographer: Lee
Taken: Leeds UK, 6:36:57pm Tue 1 Apr 2003
Original format: 2400 x 1800 JPEG, 722 Kbytes
Camera: FUJIFILM FinePix4800 ZOOM
Exposure: 1/181 sec * ISO125 * f2.80
Focal length: 9.40mm (macro Off)
Program/mode: Normal/Auto * Metering: Pattern * White balance: Auto
Flash: Not fired * Slow sync: Off
Warnings: blur No, focus Yes, AE No
Photodesk processing: Gamma; scaled
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