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Reduced visibility


Please note for observations of reduced visibility: Always report the visibility within the cloud or fog. In cases of distant valley fog during temperature inversions, fog in the hillsides or other fragments of clouds where the seeing is clear, please report under “Sun, clouds, temperature”. When reporting the visibility in the darkness, always use the meteorological optical range: It is defined as the distance, in which white lamps (not spotlights) are still visible. If the maximum visibility differs from one direction to the other, please always report the worst visibility.