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Sinking air that will increase the air pressure at the Earth's surface.

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Q: A trough in an upper air flow may cause what?
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What does a trough on an upper level isobaric chart indicate?

It indicates lower heights, which means colder air.


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Cold air aloft is associated with a surface low pressure system. The reverse is true for warm air aloft. In a baroclinic low pressure system, the upper-level low/trough is usually situated over the cold air, while upper level highs/ridges are around warm air aloft.


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