What does an isobar represent on a weather map?

An isobar represents a line of equal atmospheric pressure on a weather map. Meteorologists use isobars to illustrate areas of high and low pressure, which are crucial for understanding weather patterns. When isobars are closely spaced, it indicates a steep pressure gradient, which can lead to stronger winds. Conversely, widely spaced isobars suggest a gentler pressure change and typically lighter winds. Understanding isobars is essential for forecasters as they help in predicting weather changes and the movement of air masses.