| 21. | A high pressure system will be centered over the western Atlantic.
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| 22. | Q : How do high and low pressure systems affect a hurricane's track?
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| 23. | A low pressure system coming off the Pacific lowered temperatures in the Northwest.
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| 24. | In summer, the West Coast lies east of a subtropical high pressure system.
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| 25. | Sunday, a second, stronger low pressure system will churn northward along the front.
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| 26. | Seas were stirred by a formidable high-pressure system off Vancouver Island.
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| 27. | A high pressure system and lack of onshore breezes contributed to the heat.
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| 28. | A chilly Canadian high pressure system will build into the Northeast on Saturday.
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| 29. | Two low-pressure systems will move east in tandem across the Plains.
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| 30. | Pressure is stable, so very low pressure systems are also rare.
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