Lindsay's remnants were tracked as they moved towards the southeast until they were absorbed into a broad trough of low pressure on 13 July.

Irene formed on October 12 from a broad trough of low pressure while south of the Isle of Youth.

The large low to the northeast of The Bahamas gradually opened into a broad trough as a shortwave trough approached from the northwest.

The increasing southwesterly flow along the southeast side of the broad trough caused Nate to accelerate northeastward.

Streams of dirty water flowed always from the pans and were carried off in broad wooden troughs to the ravine.

The conventional image of a rift valley is of a broad, flat-floored and symmetric trough flanked by steep escarpments.

A broad trough absorbed the depression on October 6, and rainfall continued for the next few days.

A broad trough of low pressure formed into a tropical depression on November 4 in the central Arabian Sea.

Over the following four days, a weak low-level circulation gradually formed within a broad trough.

Shortly thereafter, the remnants of Josephine merged with a broad mid-latitude trough.