I wonder what the official textbook answer might be, if there is one.
I for one have seen pockets of fog over roads and in low lying areas
where micro climate is very close to each other but clearly particulate
or radiative cooling or something makes fog form and 40 feet away there
isn't any (yet).
How much particulate matter make fog more likely, like clouds to some
degree?
I know that some programs (like Weather Display) will indicate FOG in
the conditions visual, but it isn't there, frequently. I think it says
is is possible, but not a sure thing.
Vaisala makes a gizmo that I think for aviation is called RVR (Runway
Visual Range) that uses a light source and a receiver mounted at an
angle to each other yet only a few feet at most apart, and it does a
pretty good job of telling if the conditions are hazy but not sure if
there is a light or heavy fog output in its data stream.
Great question. I hope others with experience or training can chime in.
On 8/31/2021 2:35 PM, František Slimařík wrote:
Hi all,
I got question for hardcore meteorologists here. Is it possible to
detect fog based on classic meassured values like temperature,
humidity, preasure, etc?
Logically I would say fog appears when dew point equals current
temeperature but I guess it will not be so easy. Fogs didn't appear
here this year in my locality so I am waiting for autumn to start with
observations.
Thanks for hints
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