subtropical easterlies index

subtropical easterlies index

[‚səb′träp·ə·kəl ′ēs·tər‚lēz ‚in‚deks] (meteorology) A measure of the strength of the easterly wind between the latitudes of 20° and 35°N; the index is computed from the average sea-level pressure difference between these latitudes and is expressed as the east to west component of the corresponding geostrophic wind in meters and tenths of meters per second.