2007-01-07 02:27:23 · 2 answers · asked by hotshot69 2 in Science & Mathematics ➔ Weather
There are instruments that assess the visibility by shining a laser through the air and measuring the particulate matter that reduces the visibility. Generally though, weather observers look for what they can see clearly. They will have a chart showing the distance to prominent landmarks in different directions and the distance to them.
There are usually a lot of markers in the 0 to 2000m range for the accurate assessment of fog and fewer markers further out than that. Once the visibility is above 10km it doesn't really matter what it is but accurate assessments are still made in the same way.
2007-01-07 09:18:07 · answer #1 · answered by tentofield 7 · 0⤊ 0⤋
How far you can see? The farthest thing you can see, measure the distance between you and that object. (Buildings for example) Maybe? So if the farthest building you can see is 10 miles away, the visibility would be 10 miles!
2007-01-07 02:35:27 · answer #2 · answered by Anonymous · 0⤊ 0⤋