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 JET STREAK ON RIGHT SIDE OF TROUGH

METEOROLOGIST JEFF HABY

When a jet streak is on the right side of a trough, the momentum of the jet streak has the opposite effect as it had on the left side of a trough. The diagram below shows a time series of a jet streak on the right side of a trough and trough lifting. Lifting of a trough means the amplitude of the trough becomes less and the axis of rotation moves to the north or northeast.

A perspective in understanding how a jet streak on the right side of a trough lifts a trough is by studying the left rear convergence quadrant of a jet streak. Mass is added to the left rear quadrant of a jet streak. As the left rear quadrant moves north, the trough will lift because convergence in the base of a trough causes height rises (due to addition of mass) and a subsequent weakening of the trough. The diagram below shows the left rear quadrant of a jet streak that is exiting the base of a trough.