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How to predict visibility?


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Hello,

I understand that visibility, particularly long range one, is influenced (from my limited understanding) by temperature, air humidity and suspended particles.

I'd like to know how could I get an idea, even a rough guess, of how far could I see (both unaided or with a telescope) on land until visibility itself (and not my optics) becomes a limiting factor, before getting out in the field and measuring it by myself with known landmarks (other mountains, cities, etc.).

Overall I'd even be happy to be able to have hints on setting apart days with 50 km visibility from those with 100 km or better visibility.

Thank you

Alfred

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  • Location: Rossland BC Canada
  • Location: Rossland BC Canada

Perhaps somebody could give you a helpful answer if they knew what part of the world your interest lies, it would make the question somewhat easier to answer. In other words, where are you hoping to be able to predict 100 km visibility, you must have a pretty good view of mountains or be up fairly high, as in flat lowlands 10 to 20 km visibililty is about all you can expect at the best of times. I can sometimes see a mountain that is 100 km from my location, most days it is not visible whatever the cloud cover. Where I live, a northeast surface wind clears out the haze and smoke of nearby urban areas, and often gives the best visibility. But it may be much different where you're located. 

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