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FIG. 29. Magnitude of the August–October 1999 mean and anomalous vertical wind shear. Wind shear is calculated as the difference in wind speeds between 200-hPa and 850-hPa (contour interval is 4 m s-1). Shaded areas in (a) indicate where the vertical wind shear is less than 8 m s-1, and are considered favorable for tropical cyclone formation. Below-average wind shear values in panel (b) are shaded red, while above-average shear values are shaded blue.