It’s the time of year when the sun most often mirrors in the rain from the raindrops and delights with the rainbow. A rainbow can appear when the sun shines up to about 40 degrees above the horizon.
So the winter sun would work, but suitable clouds mostly form in the summer.
The most auspicious is the afternoon, when the sun is already setting but its toast has lifted the humid air into local deaf clouds that don’t quite cover the entire sky.
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The top friends of the rainbows should head to Hawaii, suggests local meteorologist Steven Businger in the Bulletin of the American Meteorological Society.
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There is enough brightness there, as the dusty continents are far away and the prevailing high pressure with its descending air currents tends to dry out the air mass.
On the other hand, moisture evaporates from the sea, from which local tidal currents raise deaf clouds. It is promoted by the rise of winds over the mountains, the sunshine of the day and the heat of the sea at night. I see rainbows even in thunderstorms.
Source: Tiede by www.tiede.fi.
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