1. Javelineer

    Javelineer Member

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    International Visibility Grade (Fog resource)

    Discussion in 'Setting Development' started by Javelineer, Apr 8, 2021.

    This isn't a question, but it's something I found while doing research for something else. It might be helpful for others.

    https://mae.ucf.edu/fcrar2018/wp-content/uploads/2018/05/8_FPU-Visibility-Drake-Luckey-Erickson-cr.pdf

    Ever struggle to come up with an idea of how dense a "Dense Fog" really is? How about a moderate fog, or just a thin fog or a haze? How about how far you might expect to see on an "Very Clear" day? Well, now you know!

    There's apparently a scientific difference between "Fog" and "Mist." Interestingly, by this definition, Steven King's Mist was not.
     
    Last edited: Apr 8, 2021
  2. Javelineer

    Javelineer Member

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    Code 0, Dense Fog= <50m
    Code 1, Thick Fog= 50-200m
    Code 2, Moderate Fog= 200-500m
    Code 3, Light Fog= 500-1000m
    Code 4, Thin Fog= 1000-2000m
    Code 5, Haze= 2000-4000m
    Code 6, Light Haze= 4000-10000m (that's about 2.5 to 6 miles, that's probably a clear day by the standards of some places)
    Code 7 Clear= 10000-20000m
    Code 8 Very Clear= 20000-50000m
    Code 9 Exceptionally Clear >50000m

    It's possible to see up to 120 miles on a clear enough day and with good enough optics. That would be "see the skyscrapers of Atlanta from a mountain in Tennessee" clear.
     
    Last edited: Apr 8, 2021
  3. SapereAude

    SapereAude Member

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    When I was a lad we spent every summer vacation with my grandparents in Maine. Most days, from my grandparents' porch we could see an island that's 17 miles offshore.

    On some days, though, we couldn't see the bell buoy at the entrance to the harbor -- that was less than 500 meters from the house.
     
  4. Javelineer

    Javelineer Member

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    East Tennessee is like that. You can spend a night stargazing on the shore of Nickajack or Watts Bar Lake, and the next day you wake up to fogbanks as thick as pea soup. Real fun trying to get around the mountains in those conditions.
     

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