| 1. | Overhead, cirrus clouds race across the sky, casting shadows on the ground.
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| 2. | They resemble cirrus clouds, but are far higher, some 50 miles up.
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| 3. | A sign of the coming winter is the increase of cirrus clouds.
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| 4. | Cirrus clouds are high and thin and made entirely of ice crystals.
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| 5. | The cloud-aerosol-climate interactions important for cirrus cloud thinning are not well understood.
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| 6. | High, thin cirrus clouds are likely in New Mexico and west Texas.
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| 7. | Saturday, cirrus clouds raced northeast from the southern Plains to the Ohio Valley.
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| 8. | Obviously, it is very representative of what Cirrus clouds look like.
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| 9. | Noctilucent clouds may be confused with cirrus clouds, but appear sharper under magnification.
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| 10. | It was also determined that cirrus clouds formed in the area.
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