polar-easterlies index

From Glossary of Meteorology
A measure of the strength of the easterly wind between the latitudes of 55° and 70° 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 geostrophic wind to a tenth of a meter per second.
Compare zonal index, temperate-westerlies index, subtropical-easterlies index.

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