vortices at the northern flank of the jet. A small number of mesoscale storm systems embedded in these waves develop into tropical cyclones after they move from west Africa into the tropical Atlantic, mainly during August and September. When the jet is south of normal during the peak months of the Atlantic hurricane season, tropical cyclone formation is suppressed. See also Saharan Air Layer References Further reading Kerry H. Cook: Generation of the African Easterly Jet and Its Role in Determining West African Precipitation Holton, James R.: An Introduction to Dynamic Meteorology, 2004. Atmospheric dynamics