Commercial Pilot License (CPL) Practice Exam 2025 - Free Commercial Pilot License Practice Questions and Study Guide

Wind shear is a change in wind velocity and/or direction with altitude. One of its defining characteristics is that it can exist in various atmospheric conditions, not limited to thunderstorms. While thunderstorms are commonly associated with significant wind shear due to the strong updrafts and downdrafts they produce, wind shear can also occur in clear air, in the vicinity of mountains, and during the passage of cold fronts or drylines.

Understanding that wind shear can manifest independently of storm conditions is crucial for pilots, as it highlights the necessity of being aware of this phenomenon anytime, regardless of visible weather conditions. This awareness is especially important during takeoff and landing phases, as sudden changes in wind can affect aircraft performance.

On the other hand, the notion that wind shear is always harmful to aircraft is not entirely accurate. While it can present serious challenges, particularly during low altitude operations, it is not inherently detrimental in all situations. Additionally, the idea that wind shear is never present in calm weather ignores the fact that even in seemingly calm conditions, stratification and thermal effects can lead to wind variations at different altitudes.