Which of the following factors is NOT a hazard during thunderstorms?

In the context of thunderstorms, increased air pressure is not typically considered a hazard. Thunderstorms are characterized by intense weather phenomena, including powerful updrafts, which can lead to the formation of hail and severe wind events. The presence of downdrafts can result in microbursts, which are exceptionally hazardous during flight due to their sudden and powerful downward movement of air. Turbulence is another significant hazard associated with thunderstorms, often leading to dangerous flying conditions as aircraft navigate through turbulent environments.

In contrast, increased air pressure does not present the same level of risk associated with the dynamic and violent nature of thunderstorms. Instead, changes in air pressure during these events can often be linked to the surrounding weather fronts rather than directly causing hazardous flying conditions. Therefore, while powerful updrafts, downdrafts, and turbulence all pose serious threats during thunderstorms, increased air pressure is not categorized as a key hazard.