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Positive-tilt Trough - An upper level system which is tilted to the east with increasing latitude (i.e., from southwest to northeast).
An upper level system which is tilted to the west with increasing latitude (i.e., from southwest to northeast). A positive-tilt trough often is a sign of a weakening weather system, ...
 See also: Doppler Radar, Precipitation, Advection, Potential Temperature, Sounding
  
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