How is pressure change defined in atmospheric observations?

In atmospheric observations, pressure change is primarily defined as examining pressure for significant changes, which involves noting variations that could indicate weather trends or phenomena. This approach focuses on detecting meaningful fluctuations in atmospheric pressure over time rather than just the numerical value or average pressure. Meteorologists are especially interested in these significant changes because they can be indicative of approaching weather systems, such as the development of storms or the passing of high-pressure areas.

Other definitions, like tracking pressure change over a period of time, can be too broad and may not specifically highlight the importance of identifying critical shifts. Similarly, calculating average pressure over days does not adequately capture the dynamic nature of atmospheric conditions that are crucial for precise weather forecasting. Measuring pressure at different elevations is relevant in understanding vertical profiles of the atmosphere but does not pertain directly to how pressure changes are defined in the context of surface observations. Thus, focusing on significant changes presents a more accurate framework for understanding atmospheric pressure variations.