Longwave Trough - A trough in the prevailing westerly flow aloft which is characterized by large length and (usually) long duration. Generally, there are no more than about five longwave troughs around the Northern Hemisphere at any given time.
LONGWAVE- The jet stream will have a series of waves. A wave of higher heights is a longwave ridge and a wave of lower heights is a longwave trough.
LUKG- Looking
MAV- MOS output from AVN forecast model ...
(or Retrograde Motion) Movement of a weather system in a direction opposite to that of the basic flow in which it is embedded, usually referring to a closed low or a longwave trough which moves westward at mid-latitudes.
Return flow ...
Retrogression (or Retrograde Motion) - movement of a weather system in a direction opposite to that of the basic flow in which it is embedded; usually refers to a closed low or a longwave trough which moves westward ...
a watershed to react to a given rainfall eventRetrogression(or Retrograde Motion) - Movement of a weather system in a direction opposite to that of the basic flow in which it is embedded, usually referring to a closed low or a longwave trough ...
 See also: Storm, Weather, Clouds, Temperature, Air
  
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