Final answer:
The leading edge of a gust front is most commonly associated with heavy precipitation, which results from significant differences in atmospheric pressure leading to strong winds and may precede thunderstorms.
Step-by-step explanation:
The leading edge of a gust front is frequently associated with heavy precipitation. When storm reports reveal large differences in atmospheric pressure, strong winds develop, leading to various weather phenomena. A gust front can often precede heavy rainfall and thunderstorms. While tornadoes can emerge from severe thunderstorms and are indeed associated with powerful wind shear and differences in atmospheric pressure, they are not typically considered a feature of the leading edge of a gust front. Hail is possible but is more closely tied to the presence of strong supercell thunderstorms.
Lastly, the development of a new cumulonimbus cloud is more a consequence of the atmospheric conditions behind the gust front rather than a feature of the front itself.