LONG WAVE TROUGH A wave in the prevailing westerly flow aloft which is characterized by a large length and amplitude. A long wave moves slowly and is persistent. Its position and intensity govern weather patterns over a period of days or weeks.
Often used in reference to a long wave trough or other macroscale feature. For example, a long wave trough that may move slightly westward when the "normal" movement and flow is eastward.
Long wave troughs in the atmosphere are characterized by large undulations in the prevailing winds, particularly at the jet stream level, and have significant influences on the tracks of frontal systems.
 See also: Meteor, Thunder, Rotation, Report, Earth
  
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