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What wind conditions can be expected in areas where isobars are widely spaced?

  • A

    Formation of local wind systems with strong prevailing westerly winds.

  • B

    Strong prevailing easterly winds with rapid backing.

  • C

    Strong prevailing westerly winds with rapid veering.

  • D

    Variable winds, formation of local wind systems.

Refer to figure.
The pressure gradient force (PGF) is the main driver of air movement and determines wind speed. The strength of the PGF, and consequently the wind speed, can be assessed by examining the spacing of isobars. Closely spaced isobars indicate a strong PGF and thus strong winds. Conversely, a slack or flat pressure gradient, characterized by widely spaced isobars, suggests a very low pressure gradient and light winds.

  • Typically, high-pressure areas feature widely spaced isobars and very light winds due to a flat pressure pattern.

  • In contrast, low-pressure areas tend to have closely spaced isobars, resulting in stronger winds.

Concerning this question, large distances between isobars indicate weak pressure gradients, which generally result in lighter winds. In such regions, local wind systems and variations can become more pronounced, leading to variable wind conditions.

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