Where is the upper air low in a long wave trough and a short wave trough?

Question

Where is the upper air low in a long wave trough and a short wave trough?

Answer 1

Technically, there is no upper low in a trough, simply because a trough is defined as an area of low pressure that does not have a closed circulation.  Many times that will eventually occur, where a low closes off, usually toward the edge of the trough.