When is a Pressure Gradient Force (PGF) considered strong?

A Pressure Gradient Force (PGF) is strong when isobars, which represent areas of equal atmospheric pressure on a weather map, are close together. This close spacing indicates a rapid change in pressure over a short distance, resulting in a stronger force. As pressure differences become more pronounced, the wind response is heightened, leading to stronger winds that are generated to balance the pressure differences.

In contrast, when isobars are widely spaced, it signifies a gradual change in pressure over a larger area, resulting in a weaker PGF and consequently lighter winds. Low humidity and high temperatures do not alter the strength of the pressure gradient directly; they affect other atmospheric conditions but not the PGF itself. Thus, the correct understanding of PGF strength is closely tied to the arrangement of isobars on a weather map.