What is an "Isobar"?

An isobar is defined as a line on a weather map that connects points of equal mean sea level pressure. This representation allows meteorologists to assess atmospheric pressure patterns across a geographical area. The spacing between isobars is indicative of the pressure gradient; closely spaced isobars suggest a steep pressure gradient, leading to stronger winds, while widely spaced isobars indicate a gentle pressure gradient, resulting in lighter winds.

Understanding isobars is crucial for interpreting weather systems, as areas of high and low pressure significantly affect local weather conditions. For example, in a low-pressure system, we may expect unsettled weather and potential precipitation, while high-pressure areas typically indicate clearer skies and stable weather. Thus, recognizing isobars and their implications helps pilots and weather observers anticipate weather changes effectively.