upper air

noun Meteorology.

the atmosphere above the lower portion of the troposphere.

Compare upper atmosphere.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Upper air is always a great word to know.

So is overcast. Does it mean:

a circulation of winds around a region of high atmospheric pressure, clockwise in the Northern Hemisphere, counterclockwise in the Southern Hemisphere

the condition of the sky when more than 95 percent covered by clouds

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"There are days which occur in this climate, at almost any season of the year, wherein the world reaches its perfection, when the air, the heavenly bodies, and the earth, make a harmony, as if nature would indulge her offspring; when, in these bleak upper sides of the planet, nothing is to desire that we have heard of the happiest latitudes, and we bask in the shining hours of Florida and Cuba; when everything that has life gives signs of satisfaction, and the cattle that lie on the ground seem to have great and tranquil moments. These halcyons may be looked for with a little more assurance in that pure October weather, which we distinguish by the name of Indian Summer."

-Ralph Waldo Emerson