A fast moving easterly wave of the West Africa troposphere

This paper documents a tropospheric synoptic-scale wavelike disturbance ove r Northern Africa and the tropical Atlantic during summer, in the 3.-5. day band period, different from the African wave. It has a velocity of 10-12 d egree longitude per day instead of 6-8, a slighter shorter period, i.e. 3.5 instead of 4.5 days. It is best seen between 5 degrees-7 degrees N whilst the African wave has its largest amplitude about 12 degrees N. The data use d are NCEP/NCAR reanalyses and radiosonde data.