A trough of low pressure is an elongated area where atmospheric pressure is low relative to its immediate surroundings. A trough of low pressure is sometimes indicated on the synoptic chart by a centre line or trough line denoted by a dashed line e.g.
A persistent trough of low pressure near the West Australian coastline that separates hot east to northeast winds from cooler south to southeast winds. It is most noticable during the warmer months, strengthened by diurnal heating of the land.
DIG - Action of a trough of low pressure to amplify in a southward manner in the northern hemisphere.
Normally, it moves slower than the atmospheric current in which it is embedded and is considered a weak trough of low pressure. It is often associated with possible tropical cyclone development and is also known as a tropical wave.
Generally speaking an easterly wave is a weak trough of low pressure developing from an organized cluster of thunderstorms, known as meso-scale convective systems (MCS), ...
Although best described in terms of its wavelike characteristics in the wind field, it also consists of a weak trough of low pressure. Easterly waves do not extend across the equatorial trough.
 See also: Low pressure, Ocean, Cyclone, Cloud, Trough
  
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