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Mackerel skies and mare's tails – how summer clouds signal weather change
An old English saying warns that mackerel skies and mare's tails foretell stormy weather and strong winds. Cirrocumulus and altocumulus clouds form the fish-scale pattern of the mackerel sky, while wispy cirrus streaks resemble mare's tails. Both formations signal the approach of warm fronts that push moisture to high altitudes, giving experienced sky-watchers advance warning of deteriorating conditions.
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