Dive visibility is actually quite hard to forecast (at least in the areas I dive) and I don't know if there have been empirical studies on it. Anecdotally I fi

Dive visibility is actually quite hard to forecast (at least in the areas I dive) and I don't know if there have been empirical studies on it. Anecdotally I find it's best when the wind is offshore and there is low tidal movement. But there are other factors at play, such as rainfall, etc.. This is one source I found (for wave height): https://www.aviso.altimetry.fr/en/data/products.html https://www.aviso.altimetry.fr/en/data/products.html, however it was not clear on the website whether it was paid or not. Another one I had a poke around with: https://www.ecmwf.int/en/forecasts/datasets/wmo-essential https://www.ecmwf.int/en/forecasts/datasets/wmo-essential (trying to read Grib2)