Upward moving current of air of small dimensions. A rapidly moving vertical wind as found in thunderstorms.

Similar to fog, but visibility remains more than a kilometre.

Component of atmospheric circulation along a line of latitude, towards the east or west. Atmospheric circulation along, or approximately along, parallels of latitude.

The mixture of gases surrounding a planet.

(Similar in pronunciation to 'fern'.) Wind warmed and dried by descent, in general on the lee* side of a mountain. See the explanation and animation in Fig.1 below. * The side away from [..]

Chart showing lines of equal pressure (isobars), corrected to mean sea level (MSL), over a broad area (eg Australia). Based on the synoptic observations taken simultaneously every 3 hours by weather o [..]

A physical quantity characterising the mean random motion of molecules in a physical body.

Meteorologists often consider the atmosphere in terms of layers, that is, from one height to another, or from one pressure level to another. The vertical distance between two pressure levels is called [..]

The sideways movement of air in the lower atmosphere due to the differences in air pressure (commonly called wind). Process of transfer of air mass properties by the velocity field of the atmosphere.

The mixture of gases and particles that make up our atmosphere.