Fog

Fog is a cloud of small water droplets suspended in the air near  ground level and sufficiently dense to reduce  horizontal visibility to less than 1km.

It forms when water vapor condenses into tiny droplets of varying concentration in the air.

Types

• Radiation fog. Formed due to the rapid cooling of radiating air near the earth’s surface forming a layer of fog.
• Advection fog. occurs when moist air passes over a cool surface by advection (wind) and is cooled
• Frontal fog: A thick fine drizzle associated with passage of warm front of a depression i.e. foggy conditions
• Hill fog. A low sheet of cloud covering lower slopes of hills.
• Steam fog. Formed when cold air passes over a warm water surface.