Haze

Drizzle

Mist

Fog

The movement of warm air under cold air.

Terrestrial radiation on a clear night with little wind.

Warm air being lifted rapidly aloft, in the vicinity of mountainous terrain.

Heating of the air by subsidence.

4mm.

0.5 mm.

2mm.

1mm.

FL 100

FL 390

FL 180

FL 160

Cirrostratus

Stratus

Stratocumulus

low atmospheric pressure, rotating clockwise in the southern hemisphere, counter-clockwise in the northern hemisphere.

high atmospheric pressure, rotating clockwise in the southern hemisphere, counter-clockwise in the northern hemisphere.

low atmospheric pressure, rotating clockwise in the northern hemisphere, counter-clockwise in the southern hemisphere.

high atmospheric pressure, rotating clockwise in the northern hemisphere, counter-clockwise in the southern hemisphere.

greatest at 60°N.

greatest at 40°N.

the same at all latitudes.

least at 50°N.

ratio of the vapour pressure of a sample of air to the saturation pressure at the existing temperature.

temperature at which the pressure exerted by the surroundings upon a liquid is equalled by the pressure exerted by the vapour of the liquid.

temperature at which moisture in the air will condense as a layer of frost on any exposed surface.

temperature at which the vapour present in a sample of air would just cause saturation.

This is due to changing wind directions on approach

The airfield is most probably situated near water (on the seaside).

This is typical for northern hemisphere.

This is typical for southern hemisphere.

due to the transfer of latent heat into an adjacent heat sink.

that is best achieved by very slow processes to foster heat exchange.

of an expanding volume of air without heat exchange with its surroundings.

of a volume of air gained by the compression of the respective volume.