Shallow Fog, Fogpatches and Fog

 Shallow Fog, Fogpatches and Fog are almost the same phenomenon, they are all related to the humidity of the airmass, the movement of the airmass or the amount of heatradiation out of the groundsurface.

 Complicated? Not really, look at this clip below.

Now we are into that season, almost end of summer, still some nice warm and sunny days that heat up the ground, but the nights are getting colder and the air is getting more moistier. And all these three weather conditions will occur. Experienced Pilots and Meteorologists know that it will happened, but precisely when at the hour is almost impossible to say. They all are connected to when the heatradiation has it peaks, and that is...

Early mornings, just before the sun rises or late in the afternoon, but this just half of the truth.

To the Airports and the early morning traffic, it could mean delays, accidents and troubles.

You might say that shallow fog, will disapear rather quick, but Fog Patches are more unpredictable and dangerous because they move. Fog on the other hand are more stable, in a way, but could shift in visibility, up and down very quickly.

The meteorologic defenition of fog is horisontally visibility below 1000 m, all visibility above 1000 m up to 9999 m is called mist, if you don´t have any kind of percipitation.