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Put simply, fog is very low lying cloud.
Like a cloud, fog is made up of millions of tiny water droplets or ice crystals.
There are several different types of fog.
Radiation fog forms at night under clear, cold and relatively calm conditions.
Continued cooling deepens the fog layer further.
Radiation fog can be very slow to clear during winter when the sun is weak.
Another common type is advection fog.
One example of this is coastal fog.
Fog limits visibility, delays air travel, brings danger to the roads, and makes things generally spooky.
SCIENCE of FOG FORMATION
Radiation Fog forms at night under clear skies with calm winds, when heat absorbed by the Earth's surface during the day is radiated into space.
Freezing Fog occurs when it's 32°F or below and water droplets touch a surface, upon which they can freeze.
Valley Fog forms when air along hilltops begins to cool after sunset.