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On a weather map, what does very close spacing of isobars indicate?

Strong winds

Isobars packed tightly together mean a steep pressure gradient: the pressure changes a lot over a short distance. Air moves from high to low pressure, and the stronger that gradient, the more air is forced to accelerate, producing stronger winds. Conversely, when lines are spaced far apart, the gradient is weak and winds are lighter. Humidity isn’t directly indicated by how close the isobars are, since it’s about moisture content, not pressure spacing.

Light winds

No wind

High humidity

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