| 1. | Like all other surface features, sea breeze fronts lie inside troughs of low pressure.
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| 2. | A sharp trough of low pressure organized into a tropical depression on August 16.
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| 3. | Continued weakening took place as a trough of low pressure approached from the southwest.
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| 4. | The storm tracked towards Bermuda along a trough of low pressure in the Atlantic Ocean.
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| 5. | At night, winds were light as a trough of low pressure lingered over the area.
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| 6. | A few clouds were seen over the Northwest in association with a lingering trough of low pressure.
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| 7. | The following day, however, the depression became less defined and degenerated into a trough of low pressure.
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| 8. | A strong upper-level trough of low pressure was expected to move into the West, producing rain and snow.
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| 9. | The mountain-pass snows developed as a cold upper-level trough of low pressure arrived from the Gulf of Alaska.
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| 10. | Only the Northwest saw moderate temperatures as a trough of low pressure brought cool weather and scattered showers.
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