Why are daily weather forecasts based primarily on air-mass movements?

Daily weather forecasts rely heavily on air-mass movements because these movements dictate the distribution of temperature, humidity, and pressure across regions. Air masses, characterized by their distinct temperature and moisture properties, interact with one another and can lead to various weather phenomena, such as storms or clear skies. By tracking the movement of these air masses, meteorologists can predict short-term weather changes more accurately. Understanding how air masses shift helps in anticipating conditions like precipitation, wind patterns, and temperature fluctuations.