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local extra observation

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local extra observation [′lō·kəl ′ek·strə ‚äb·zər′vā·shən]
(meteorology)
An aviation weather observation taken at specified intervals, usually every 15 minutes, when there are impending aircraft operations and when weather conditions are below certain operational weather limits; the observation includes ceiling, sky condition, visibility, atmospheric phenomena, and pertinent remarks.


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