What type of winds flow parallel to isobars and are higher up in the atmosphere?

• A. Trade Winds
• B. Geostrophic Winds
• C. Westerlies
• D. Subtropical Highs

Answer: (B)

Geostrophic winds are those that flow parallel to isobars and are typically found higher up in the atmosphere, such as in the upper levels of the troposphere. This type of wind results from a balance between the pressure gradient force, which acts perpendicular to the isobars, and the Coriolis force, which acts perpendicular to the direction of motion. As a consequence, the winds adjust until they travel parallel to the isobars rather than across them, leading to a more stable flow pattern.

In contrast, trade winds are primarily found in the lower atmosphere and are driven by the uneven heating of the Earth, while westerlies are also lower level winds, particularly prevalent in mid-latitudes. Subtropical highs refer to high-pressure areas rather than a type of wind. Therefore, recognizing that geostrophic winds are characterized specifically by their parallel flow along isobars at higher altitudes clarifies why this choice is correct.