Which weather measurement is most useful for predicting changes in the next 24 to 48 hours?

Atmospheric pressure is the most useful weather measurement for predicting changes in the weather over the next 24 to 48 hours because it provides insight into the movement of air masses and the development of weather systems. Changes in atmospheric pressure can indicate the approach of a storm or a clearing trend, allowing meteorologists to forecast weather conditions more accurately.

For instance, a rapid decrease in atmospheric pressure typically suggests that a low-pressure system is moving in, which is often associated with clouds, precipitation, and stormy conditions. Conversely, an increase in pressure often indicates a high-pressure system, which generally brings clearer, calmer weather.

While wind speed, temperature, and rainfall amount are essential for understanding current weather conditions, they do not provide as direct information about upcoming weather changes. Therefore, monitoring atmospheric pressure trends is a critical aspect of short-term weather forecasting.