Which of the following statements about thunderstorms is true?

The statement that all thunderstorms should be avoided by at least 10 miles is true due to the unpredictable and hazardous nature of thunderstorms. Thunderstorms are capable of producing severe weather phenomena such as turbulence, lightning, heavy precipitation, hail, and strong downdrafts, which can significantly impact flight safety. Maintaining a distance of at least 10 miles helps ensure that pilots avoid these dangers, as the conditions within and around thunderstorms can rapidly change and become more severe.

While detection equipment may sometimes experience issues, and visibility can indeed be affected due to heavy rain or other factors associated with thunderstorms, the fundamental principle of maintaining a safe distance is critical for operational safety. Therefore, avoiding thunderstorms is a key precaution for pilots to help mitigate risks associated with flying in or near adverse weather conditions.