| 21. | Humid forests could only establish once Madagascar was north of the subtropical ridge by the Oligocene.
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| 22. | The forecast break in the subtropical ridge finally occurred on the 15th, causing a northwest motion.
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| 23. | This is attributed to a persistent subtropical ridge of high pressure located north of the cyclone.
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| 24. | Kai-tak was located along the southern periphery of a deep subtropical ridge positioned over southeast China.
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| 25. | At this time Karl began to turn sharply northward into a weakness in the subtropical ridge.
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| 26. | At this moment, Kai-tak was expected to rapidly drift eastward due to the persistent subtropical ridge.
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| 27. | Initially, the storm moved westward under the influence of a strong subtropical ridge to the south.
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| 28. | After becoming a tropical storm on August 30, the subtropical ridge caused Leslie to turn west-northwestward.
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| 29. | The system was tracking along the southwestern periphery of a deep-layered subtropical ridge to its north.
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| 30. | Lehar continued to track in a westerly direction just along the periphery of a subtropical ridge.
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