What is a sigma plot?

• A. A chart to track air traffic
• B. A graphical representation used to assess stability in the atmosphere
• C. A map showing global flight routes
• D. A type of radar technology

Answer: (B)

A sigma plot is a graphical representation specifically used in meteorology to assess the stability of the atmosphere. By plotting environmental variables against sigma levels (which are a function of atmospheric pressure), scientists and meteorologists can analyze how temperature, moisture, and wind conditions interact at different altitudes. This helps in understanding and predicting atmospheric behavior, such as the likelihood of thunderstorms or other weather events.

This assessment is crucial for pilots and meteorologists because it provides insight into vertical movements within the atmosphere, which can affect flight safety and overall weather forecasting. In contrast to the other options, which pertain to unrelated aspects of aviation, a sigma plot focuses specifically on atmospheric stability and thermodynamic properties, making it a valuable tool in weather analysis.