The southern (northern in the southern hemisphere) portion of a trough advances, perhaps developing a cut-off circulation, and slowly warming out, whilst the opposite (residual) portion of the trough becomes quasi-stationary, maintaining a cyclonic pattern at the surface.
CYCLONIC TROUGH DISRUPTION
Meaning of CYCLONIC TROUGH DISRUPTION in English
Weather and meteorology English vocabulary. Английский словарь погоды и метеорологии . 2012