What is the recommended distance to avoid a thunderstorm when flying above FL230?

When flying above FL230, the recommended distance to avoid a thunderstorm is 20 nautical miles. This distance is based on safety protocols established to minimize the risk of encountering severe turbulence, lightning strikes, and other hazardous conditions associated with thunderstorms. Thunderstorms can create significant atmospheric disturbances that extend well beyond their visible structure, and maintaining a safe distance helps ensure a buffer against these potential dangers.

The recommendation of 20 nautical miles is considered appropriate because it allows pilots to avoid the strongest cells and any associated hazardous phenomena reliably. In addition, many sources in aviation safety, including guidelines from regulatory authorities, support this distance as an effective means to ensure safety during flight operations.