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The phenomenon is commonly called autumn colours [2] or autumn foliage [3] in British English and fall colors, [4] fall foliage, or simply foliage [5] in American English. In some areas of Canada and the United States , " leaf peeping " tourism is a major contribution to economic activity.
The exact cause of green thunderstorms is still unknown, but it could be due to the combination of reddened sunlight passing through very optically thick clouds. Yellowish clouds may occur in the late spring through early fall months during forest fire season. The yellow color is due to the presence of pollutants in the smoke.
Idealised depiction (at equinox) of large-scale atmospheric circulation on Earth Long-term mean precipitation by month. Atmospheric circulation is the large-scale movement of air and together with ocean circulation is the means by which thermal energy is redistributed on the surface of the Earth. The Earth's atmospheric circulation varies from ...
Red is also created by oxygen but in the highest part of the atmosphere at more than 150 miles above the Earth's surface. Purple and blue are related to nitrogen, with purple lights appearing ...
Rain water sample (left) and after the particles settled (right). Dried sediment (centre) The Kerala red rain phenomenon was a blood rain event that occurred in Wayanad district of southern Indian state Kerala on Monday, 15 July 1957 and the colour subsequently turned yellow [1] and also 25 July to 23 September 2001, when heavy downpours of red-coloured rain fell sporadically in Kerala ...
A late arrival of fall-like weather will also delay the timing of peak colors. The best time to view fall foliage extends from the end of September through October, and reservations at popular ...
Astronomical fall starts on the autumnal equinox, between Sept. 2 Equinox comes from the Latin words aequi, which means equal, and nox, which means night. On the day of the equinox, the sun's rays ...
Severe weather can occur under a variety of situations, but three characteristics are generally needed: a temperature or moisture boundary, moisture, and (in the event of severe, precipitation-based events) instability in the atmosphere.