| Height of the base of the highest layer of clouds covering more than half of the sky below 20000 ft. |
| Height of the base of the lowest layer of clouds covering more than half of the sky below 10000 ft. |
| Altitude of the base of the lowest layer of clouds covering more than half of the sky below 20000 ft |
| Height of the base of the lowest layer of clouds covering more than half of the sky below 20000 ft |
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