| 21. | Shortly after, the depression sharply turned north and degenerated into a trough of low pressure, no longer a tropical cyclone.
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| 22. | But the ridge's grip will loosen over southern California, allowing a potent trough of low pressure to slip toward the coast.
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| 23. | Tropical Disturbance 02F developed within a trough of low pressure to the north-east of the Santa Cruz Islands during November 18.
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| 24. | In the wake of the disturbance, a trough of low pressure will be left from the western Dakotas to northwest Texas.
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| 25. | After being named the system moved erratically towards the south-southeast, as it interacted with a mid troposphere trough of low pressure.
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| 26. | In turn, hot, less dense air will lower barometric pressures, creating a trough of low pressure just east of the Appalachians.
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| 27. | Scattered showers and thunderstorms will cover the Northeast on Thursday as a trough of low pressure swings south from Ontario, Canada.
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| 28. | During February 26, a tropical depression developed within a trough of low pressure, to the northeast of Rarotonga in the Cook Islands.
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| 29. | Widely separated showers and lonely thundershowers will affect the Northeast as a weak trough of low pressure swings east across the region.
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| 30. | Debby maintained tropical cyclone status while crossing Florida, but degenerated into a trough of low pressure by 1800 UTC on June 27.
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