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 Figure 5.7: Illustration of the two basic wind conditions for the stratospheric QBO, which occur over the tropics at 50 hPa (or 20 km altitude) during the summer seasons of both hemispheres. The left diagram shows conditions during the easterly phase when moderate easterly winds occur on the equator and strong easterly winds occur at 10-15^o lat. During the westerly phase (right diagram) stratospheric winds on the equator are from the west and weak easterlies occur at 10-15^o lat.