High pressure refers to a condition where the atmospheric pressure is higher than the surrounding areas. This phenomenon often occurs in weather systems, leading to clear skies and calm conditions. High-pressure systems can influence local climates and are typically associated with fair weather. In meteorology, high pressure is measured in units such as millibars or inches of mercury. These systems can affect air movement, causing winds to flow outward from the center. Understanding high pressure is essential for predicting weather patterns and preparing for changes in climate conditions.