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At dawn this Saturday in Manlleu it was possible to see a small rainbow in the reddish sky and a faint curtain of precipitation that sees a change in weather, as seen in The Readers' Photos of La Vanguardia.
If a curtain of precipitation reaches the surface, it is called Praecipitatio (this is a supplementary feature of the clouds, since they start from them).
Now, when this precipitation evaporates and disappears before reaching the ground, it is called virga. In this case, the curtain this morning in Manlleu was still weak.
In meteorology, the virga is the hydrometeor that falls from a cloud, but evaporates before reaching the ground. At high altitudes, precipitation falls mostly as ice crystals before it melts and eventually evaporates.
A virga may play a role in the genesis of a storm cell, where light particles from a cloud become incorporated into nearby supersaturated air masses, acting as nuclei for the next cumulonimbus-like storm cloud, and thus continue to form storms.
A rainbow or rainbow is an optical and meteorological phenomenon that consists of the appearance in the sky of an arc (sometimes two or more) of multicolored light.
It is caused by the decomposition of sunlight into the visible spectrum, which occurs by refraction, when the sun's rays pass through small droplets of water contained in the Earth's atmosphere.
Although the rainbow is a continuous gradient of spectral colors, it is considered that these can be defined in seven fundamental colors: red, orange, yellow, green, cyan, blue and violet, which are equivalent to those mentioned by the scientist Isaac Newton in 1704. .
