The DANA (isolated depression at high levels) that has devastated the province of Valencia this week has left very shocking images and not all have been captured at ground level.
A video broadcast by Valencian regional television has shown the spectacular formation of the clouds that unleashed the storm that caused the serious flooding.
These are clouds of the type cumulonimbus, also known as ‘storm clouds’. They are internally formed by a column of warm, humid air that rises in a rotating spiral.
Its base is usually less than two kilometers high while the summit can reach about 11 to 12 km altitude. These clouds often produce intense precipitation and thunderstorms, especially when they are fully developed.
They can form singly, in groups, or along a cold front in a line of instability. Cumulonimbus storm cells can produce torrential rain of convective nature and flash floods, as well as straight-line winds.
The typical places of great formation of these clouds are found, in the temperate zones, around a cold front linenear the oceans (where the sea breeze can provide energy to the storm, or in mountains on the windward slopes where the wind is forced to rise causing warmer (less dense) air to rise, giving rise to heavy precipitation and storms.
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