Meaning of subtropical high

subtrop'ical high'

Pronunciation: [key]
— Meteorol. Meteorol.
  1. one of several highs, as the Azores and Pacific highs, that prevail over the oceans at latitudes of about 30 degrees N and S. Also calledCf.(def. 41).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.