Temperate-westerlies index

From Glossary of Meteorology

temperate-westerlies index

A measure of the strength of the westerly surface wind between 35° and 55°N.

The index is computed from the average sea level pressure difference between these latitudes and is expressed as the west to east component of geostrophic wind to a tenth of a meter per second.
Compare zonal index, polar-easterlies index, subtropical-easterlies index.