Tropical wave

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Tropical Waves (also easterly waves , German  eastern waves , called) are areas of high thunderstorm activity and cloud cover , which originated in the intertropical convergence zone have. Tropical waves are usually brought in a westerly direction by easterly winds that prevail in latitudes near the equator . They are elongated, north-south oriented areas with relatively low air pressure .

Atlantic

In the Atlantic Ocean to tropical waves form mostly in North Africa and migrate due to the trade winds , to the west . About 60% of the tropical cyclones in the Atlantic originate from tropical waves, while 85% of the strong Atlantic hurricanes (category 3+ on the Saffir-Simpson hurricane wind scale ) originate from them.

Strong wind shear is often the cause of a regression of tropical cyclones to tropical waves. If the shear breaks in the higher altitudes, the wave can intensify again into a tropical storm.

If a tropical wave moves too fast, it cannot develop. Nevertheless, it can reach wind speeds of gale force . Finally, when the wave slows down, a circulation is formed and the wave becomes a tropical cyclone.

Eastern Pacific

Most of the tropical storms in the Eastern Pacific are formed from tropical waves that originate in North Africa and migrate to the Pacific via Central America.