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It starts as a tropical disturbance, but throw in cyclonic circulation — that is, counterclockwise motion in the northern hemisphere, clockwise in the southern hemisphere — and faster wind speeds, and you have a tropical depression.

A tropical disturbance with a 60% chance of cyclone formation is trailing Bret.

A tropical disturbance that is trailing Bret has a 50% chance of formation, according to the National Hurricane Center.

U.S. weather forecasters were warning about a new tropical disturbance, expected to move north across the Gulf of Mexico next week that could bring more rains to Louisiana.

The National Hurricane Center is monitoring a tropical disturbance in the Atlantic Ocean that could develop into Tropical Storm Elsa.