Around that time, Gladys curved northward in response to a weak trough in the westerlies.

Throughout May 1972, a series of weak troughs moved across the eastern United States.

However, the relatively weak trough moved very quickly, and instead of fully engaging Elena, its axis passed over the storm's center.

The storm then headed northwestward, until a weak frontal trough turned Felix northward on September 1.

The subtropical cyclone became a weak trough on November 19, according to the CPTEC.

The next day, Ellen intensified into a hurricane before taking a sharp turn to the north-northwest in response to a weak trough moving northeast from the Bahamas.

A weak low-level trough extended from the Caribbean Sea to south of Mexico, disrupting the normal flow of westward steering currents.

Instead, the system remained disorganized, bringing rainfall to Cuba, Florida, and the Bahamas before it was absorbed by a weak trough in the Gulf of Mexico.

Tropical Storm Amy originated from a weak trough on June 24 accompanied by scattered showers and thunderstorms over Florida.

The season's first named storm originated on August 4 within a weak trough of low pressure that formed off the coast of South Carolina.