Since today we are talking about “Inverted Troughs” I thought it would be a good idea to explain what it is and what it means here in our area.
An inverted trough is an atmospheric trough which is oriented opposite to most troughs of the mid-latitudes. Some inverted troughs are tropical waves which can also be referred to as easterly waves.
Most of the troughs of Low Pressure are areas of decreasing atmospheric pressure (we see it when the barometer falls) are from SOUTH to NORTH while our Inverted Troughs are characterized by that decreasing pressure from NORTH to SOUTH. While normal troughs or tropical waves move from EAST to WEST, INVERTED TROUGHS move from WEST to EAST.
All Troughs can be at the surface, upper level or both depending on the conditions. Most Troughs bring clouds, showers and a change in wind directions especially after the passing of the trough which is a result of convergence which causes lifting of moist are behind the trough line.
Trough