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The fog and altocumulus clouds have combined at dawn in the surroundings of Manlleu, in Osona, where in this video for La Vanguardia Readers’ Photos we can see the hypnotic movement of these clouds.
Altocumulus clouds are showy medium-altitude clouds, around 2 to 6 km, with cigar-shaped or rolled shapes, white to grayish in color.
They are often used as signs that a storm is approaching, very common in the Mediterranean summer. Altocumulus clouds often precede a cold front. And, on hot, humid mornings, they signal the development of storm clouds that could occur throughout the day.
Fog is a meteorological phenomenon that consists of the suspension of very small water droplets in the atmosphere or of moist hygroscopic particles, which reduce horizontal visibility to a distance of one kilometer or more.
If the meteorological phenomenon gives a vision of 1 km or less, it is considered fog; and if it allows you to see more than 1 km, the phenomenon is fog.
