Fall is a season conducive to rainbow in Normandy, while many of us observe them at the end of the year.Response elements.
Par Maxence GorreguesPublié leLiberté CaenVoir mon actuFor several days at the end of autumn 2021, rainbows regularly have come to dress the sky of Normandy.A little more than usual.As if the season was conducive to these always spectacular phenomena, especially when they draw a huge disc of colors relying on the horizon.
Rather in the morning and evening
If the rainbows occur throughout the year, they are particularly frequent in the fall, at a time when the weather is unstable.And this is also true for spring."They generally form when time is unstable at altitude, that is to say with a mixture of thinning and showers," explains Christopher Bribet of Basse-Normandie Météo.Also, the lower the sun, the more visible it is."This is why we see most often in the morning and evening.»»
And the more capricious the weather, the more numerous they are.Each time, the same magic operates: "The rainbow is formed when the sun's rays cross the drops.»» Et systématiquement, ce phénomène météorologique lumineux en forme d’arc apparaît à l’opposé du soleil.The more light in the back of the person who observes the rain curtain is important, the more intense the colors of the arc.
White arcs
There are several types of rainbow.The most frequent is distinguished by a line of purple inside and a red line outside.The white light that crosses the drops breaks down into seven colors: purple, blue, green, yellow, orange and red, in this bottom up to the top.More rarely, the colors can be reversed.Also, in the fall, a period of the year when the fogs are frequent, it happens to see white rainbow appear!
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As for their duration, it varies depending on the showers."The great maximum for the duration of a rainbow is 30 minutes," specifies Christophe Bribet.The rainbow is always ephemeral because the showers hardly last long.»».The advantage right now is that it comes back quickly.
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