In what circumstances can hail be encountered?

Hail formation is primarily associated with strong thunderstorms, particularly those associated with severe weather conditions, but it is important to note that it cannot be restricted only to severe thunderstorms. Hail can form in updrafts of thunderstorms, where supercooled water droplets gather and coalesce. However, there are instances in which hail has been observed in areas with relatively clear air, usually due to the dynamics of a nearby thunderstorm influencing the local environment.

When talking about the other scenarios, while it is true that severe thunderstorms are the most common hail producers, it is too limiting to state that hail can only occur in these storms. Flying at high altitudes or in proximity to mountains does not specifically lead to the formation of hail. High altitudes may experience colder temperatures conducive to ice formation, but that is not a direct correlation with hail as a weather phenomenon. Additionally, mountains can create localized weather patterns, but the presence of hail is primarily related to the strength of convective currents within thunderstorms rather than just being near mountainous terrain.

Thus, the correct understanding lies in recognizing that hail can be encountered under various conditions, including but not limited to clear air, particularly in relation to dynamic atmospheric changes influenced by nearby storms.