tropical wave
easterly wave
tropical easterly wave

It likely developed from a tropical wave several days before.

It moved quickly to the west, and broke down to a tropical wave the next day.

On July 29, a broad low pressure area developed in association with the tropical wave.

A larger tropical wave emerged off the west coast of Africa a few days later.

A tropical wave formed on July 28 over fairly warm water.

In most seasons, the majority of storms develop from tropical waves.

The storm lost its circulation and became a tropical wave on August 12.

Two days later, the tropical wave organized into a low pressure area, due to favorable conditions.

A hundred or so of these tropical waves, as meteorologists call them, do the same every summer and fall.

Four days later, the depression degenerated into a tropical wave.

Moving little, a broad surface low developed with the cloud mass, and a tropical wave moved through the area.

On June 22, showers increased in associated with a tropical wave several hundred miles away form land.

Four of the storms developed into hurricanes, although for the first time in over 24 years none were from tropical waves.

Convection increased and organized after a tropical wave reached the area.

The depression formed on July 25 from the same tropical wave that created another weather system.

On October 10 a tropical wave moved off of Africa.

The storm formed in early October from a tropical wave with a nearby low pressure area.

The system degenerated into an open tropical wave the next morning, and remained in that state for nearly two days.

Convection began to increase in a tropical wave on September 9 and a few days later a surface low developed.

Operationally, the system was classified a tropical wave until a day later.

The storm originated from an area of low pressure associated with a tropical wave on August 26.

A tropical wave moved off the African coast on July 19.

A tropical wave forming over sea surface temperatures of 23 degrees.

Over the next week, clouds and other thunderstorms grew near the tropical wave.

A tropical wave passed through the area and gave it mild convection.

It has been suggested that some eastern Pacific Ocean tropical cyclones are formed out of tropical easterly waves that originate in North Africa as well.

Tropical waves, easterly waves, or tropical easterly waves, also known as African easterly waves in the Atlantic region, are a type of atmospheric trough, an elongated area of relatively low air pressure, oriented north to south, which moves from east to west across the tropics causing areas of cloudiness and thunderstorms.