Final answer:
The forms of turbulence typically reported on GFAs relate to chaotic airflow in aviation. Turbulence can range from light to extreme intensity, indicating the impact it can have on aircraft control and passenger comfort.
Step-by-step explanation:
The forms of turbulence listed on GFAs (Graphical Forecast for Aviation) are usually related to atmospheric conditions that can affect aircraft during flight. Turbulence itself refers to irregular or chaotic flows in a fluid or gas which means in the atmosphere, it is a result of various factors including temperature, pressure variations, obstacles in air flow, or jet streams. One of the common forms of turbulence encountered in aviation is turbulent flow, versus laminar or smooth flow. When pilots encounter turbulence, they often report it because it can indicate dangerous flying conditions, especially when severe. In aviation reports and forecasts, turbulence is typically described in terms of intensity: light, moderate, severe, or extreme. Each level of intensity has different implications for flight safety and passenger comfort. Light turbulence might cause slight, unsteady changes in altitude or attitude. Moderate turbulence is more noticeable and could result in changes in altitude and attitude but the aircraft remains in control at all times. Severe turbulence can cause large, abrupt changes in altitude and attitude, and may lead to temporary loss of control. Extreme turbulence is rare but can be very dangerous, leading to structural damage to the aircraft.