Retrogression or Retrograde Motion
Retrogression or Retrograde Motion :
means motion that is backwards from the usual way things move in the Northern Hemisphere extratropics: which is from west to east. in meterology, the term is used in relation to atmospheric waves or pressure systems. When meterologists say that a pattern will retrograde, they mean that the troughs and ridges will end up further west than they were previously. Normal motion (over the United States) is progressive, or prograde, which means (weather systems move) from west to east
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