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Title: altocumulus undulatus clouds
Caption: Altocumulus undulatus (mackerel sky) cloud formation in Northern Ontario, Canada. The rippled appearance of these high altitude clouds are the result of wind shear and they are often indicative of deteriorating weather conditions.
Credit: Album / Science Source / Stephen J. Krasemann
Image size: 5000 × 7546 px | 107.9 MB
Print size: 42.3 × 63.9 cm | 1968.5 × 2970.9 in (300 dpi)