At the time, the cyclone's motion slowed, and an adjacent upper trough near 50 W allowed the cyclone to gradually turn north.

The placement of the upper atmospheric trough allowed very little movement of the associated front from Thursday to Saturday.

An upper trough moved over the central United States.

The storm did not get stronger because of a very strong wind shear from a strong tropical upper tropospheric trough.

On July 12, the upper trough cut off southwest of the disturbance and the organization improved.

Roxanne formed from a tropical wave that merged with a broad low pressure area and an upper trough just off the coast of Honduras.

Reintensification occurred as the upper trough to its north acted as an outflow channel.

Strong thunderstorm activity can be associated with the features when located east of a tropical upper tropospheric trough.

However, unless we put in a pump of some sort, (Battery or Generator), the upper trough will quickly empty.

A tropical wave merged with an broad low pressure area and an upper trough near Honduras.