What is fog?

You may be familiar with fog, but have you ever wondered what it is, or how it forms?

Put simply, fog is very low lying cloud. Like a cloud, fog is made up of millions of tiny water droplets or ice crystals that form when air is cooled close to the Earth’s surface and water vapour within it condenses. These droplets are light enough to remain suspended in the air There are several different types of fog, each forming under different conditions. Radiation fog forms in situ at night under clear, cold and relatively calm conditions, when water vapour close to the cold ground condenses as it cools. Radiation fog can be very slow to clear during the winter months when the sun is weak. Advection fog forms when moist air flows over a relatively cold surface and is cooled. When this happens the air can no longer hold moisture and so condenses, forming fog. A common example of this is coastal fog where relatively warm moist air passes over the cool surface of the sea. Coastal fog usually occurs in the spring and summer months when conditions begin to warm up but the sea which warms more slowly, stays relatively cold

You can find more information on different types of fog, on the Met Office website:

Music: Betty Trinh - Sunday Afternoon

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We are the Met Office, the UK’s national weather service, and every day of the week we bring you a morning weather forecast and an afternoon weather forecast so that wherever you are in the UK we have you covered. Forecasts and any weather warnings are accurate at time of recording.

To ensure you have the most up to date weather information, check the hourly forecast and live warnings on the Met Office website or app.

[busdrinker]

Nice music, very vibeyyy, exactly what I like on my fog videos

[FictionVent]

Video has good graphics, but the music is oddly distracting. The text on screen has no narration, forcing you to either read or watch the visuals. This video has done the opposite of what it set out to do.

[pawar_me]

good but ur voice will add stars to the explaination

[Victorraouf]

I wouldn't have opened YouTube if I wanted to read

[debasreedas]

The cloudy fog is covered everywhere and its too dangerous.

[aakashshinde]

Can we do something from which fogg will not produced

[bangtan]

Fogs are formed due to concept of Temperature Inversion.

[bboyatmc]

Fog is radiation? wow that changes a lot

[Shamr]

Music is horrible, explanation os solid

[Themaninthesuit]

The fog is coming on June 2026 don’t open the doors or windows stay calm if you hear cries or screams outside and maybe knocks DONT open the door this is your last warning