The horizontal pressure gradient is primarily dependent on what factor?

• A. The variability of temperature
• B. The spacing of isobars
• C. The elevation of the terrain
• D. The wind speed

Answer: (B)

The horizontal pressure gradient is primarily influenced by the spacing of isobars on a weather map. Isobars are lines that connect points of equal atmospheric pressure. When isobars are closely spaced, it indicates a steep pressure gradient, which typically results in stronger winds. Conversely, when isobars are spaced further apart, the pressure gradient is gentle, leading to lighter winds.

Understanding this relationship is crucial for interpreting weather patterns and predicting wind behavior. A tight spacing of isobars signifies significant differences in atmospheric pressure over a small distance, thus producing stronger horizontal winds. This principle is fundamental in meteorology, as it helps meteorologists gauge wind strength and direction based on pressure patterns illustrated on weather maps.