What method is NOT one of the 3 ways to measure wind velocity when a wind gauge is absent?

The pressure method is not recognized as one of the common techniques for measuring wind velocity in the absence of a wind gauge. The other methods—flag, pointing, and observation—are widely utilized due to their simplicity and effectiveness in gauging wind strength and direction.

The flag method involves using a flag or any lightweight fabric that can indicate wind direction and strength based on its movement. The pointing method typically refers to observing the effects of the wind on one's own body position or light objects to assess wind velocity. The observation method encompasses a general assessment through environmental cues, such as observing smoke movement or tree branches, to gauge the wind's characteristics.

Each of these methods relies on visual or physical indicators to determine the wind’s effects, making them practical alternatives in situations where specialized equipment is unavailable. In contrast, the pressure method does not relate to direct observation or practical measurement of wind but instead pertains to different contexts, such as meteorological assessments involving air pressure rather than local wind conditions.