Option 1 states "Conditional and convective instability" as a favorable condition for the occurrence of a thunderstorm. This means that there should be a significant difference in temperature and moisture between the lower and upper atmosphere, creating an unstable environment that is conducive to the development of thunderstorms. Therefore, option 1 is a favorable condition.

Option 2 states "Adequate supply of moisture in the lower atmosphere" as a favorable condition. Moisture is essential for thunderstorms as it provides the necessary fuel for the development of clouds and precipitation. Therefore, option 2 is a favorable condition.

Option 3, which is the correct answer, states "Advection of cold dry air in the lower troposphere and warm moist air in the upper troposphere" as a non-favorable condition for thunderstorm occurrence. This means that the presence of cold dry air in the lower atmosphere and warm moist air in the upper atmosphere is not conducive to the development of thunderstorms. Thunderstorms thrive on the interaction between warm moist air rising and cold dry air sinking, so if these conditions are not present, thunderstorms are less likely to form.

Option 4 states "A synoptic situation of low-level convergence and upper-level divergence" as a favorable condition for thunderstorm occurrence. Thunder