| 11. | Isolated thundershowers will develop in the afternoon, as a trough of low pressure presses east through the region.
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| 12. | In early September, a trough of low pressure moved south into the Gulf of Mexico, and became stationary.
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| 13. | Around 1830 trough of low pressure.
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| 14. | This precipitation was associated with an unstable local aimass aided by the proximity of a trough of low pressure.
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| 15. | The disturbance was part of a broad trough of low pressure settling over the west coast of North America.
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| 16. | A trough of low pressure digging into the West Coast brought unsettled weather to a chunk of the West.
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| 17. | Farther west, scattered showers and thunderstorms will speckle the southern Rockies as a trough of low pressure drifts overhead.
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| 18. | The precursor trough of low pressure produced torrential rainfall across Florida, peaking at 17.5 inches ( 440 mm ).
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| 19. | As the disturbances pressed inland Sunday night, they started to carve out a trough of low pressure over the Rockies.
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| 20. | The depression then eventually opened up into a trough of low pressure by 00 : 00 UTC on September 1.
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