8.4 Weather Maps

8.4.2 Identify the following features found on surface weather maps:

(a) isobars;

Isobars are lines on a weather map, connecting points of equal atmospheric pressure.

(b) anticyclone (“high”);

An anticyclone is an anticlockwise circulation of winds around a central region of high atmospheric pressure, in the Southern Hemisphere.

(c) depression (“low” or “cyclone”);

A depression is a clockwise circulation of winds around a central region of low atmospheric pressure, in the Southern Hemisphere.

(d) ridge of high pressure;

A ridge is an extension of a high.

(e) trough of low pressure;

A trough is an extension of a low.

(f) col;

A col is the area between two highs and two lows where hardly any pressure gradient exists.

(g) fronts (cold, warm (warm sectors), occluded and stationary);