>>3620069>I don't know how to plan or spot weather changes for when heavy fog comes down at night.Check your local forecast. There's an app I use called WUnderground, which is free, and provides local weather forecast data for the entire world basically. It'll include forecast temperatures, wind speeds, and humidity, which are important. Usually, fog happens during the following
> low wind speeds of a few knots or under about 8 MPH> high humidity of 90% or greater, the higher the better of course> when the ambient air temperature and dew point are within a few degrees of each otherBasically, fog is just a cloud on the ground. It happens when the air is so saturated that it's unable to hold anymore water, so little water droplets form in the air. In some areas of the world it happens with greater frequency (San Francisco Bay area, for instance), but in parts like my own, it's actually somewhat rare. Often where I am, we see it when warmer air starts to come back in following a spell of colder, drier air that was brought in by a cold front and subsequent high pressure system. It happens at night normally because the sun coming out "burns off" the fog by rising the temperature and making it harder for it to form near the surface. My explanation is actually the simple version, as there's different types of fog that form in different conditions, but with that knowledge I've been somewhat successful in predicting it over the past few months. I've never tried to photoshop fog myself, but I hope I helped somewhat.
