What is the minimum distance to maintain from thunderstorms for safe flying?

Maintaining a safe distance from thunderstorms is crucial for ensuring safe flying conditions. The recommended minimum distance to keep from thunderstorms is 20 miles, particularly when positioning yourself upwind. This distance helps pilots avoid dangerous weather phenomena associated with thunderstorms, such as severe turbulence, lightning, hail, and downdrafts, which can occur well away from the storm's visible rain or cloud structure.

The rationale for choosing this distance is based on the understanding that severe storms can produce weather effects that extend beyond the storm itself. By flying 20 miles upwind of a thunderstorm, pilots can minimize the risk of encountering these hazardous conditions and maintain better control over their aircraft.

Other options may suggest various distances that are less than optimal for maintaining safety. Therefore, recognizing that 20 miles upwind is the standard ensures that pilots prioritize safety while navigating around thunderstorms.