SODAR

SODAR plot
24 hour wind time-height cross-section from the Reagan TX SODAR. Colors indicate the wind speed, barbs the vector wind.
24 hour wind time-height cross-section from the Reagan TX SODAR. Colors indicate the wind speed, barbs the vector wind.

Sound Detection and Ranging (SODAR) is a weather observing device that uses sound waves to detect wind speed and direction at various elevations above the ground. The difference between SODARs and WPRs is that SODARs use acoustic signals rather than electromagnetic signals to remotely sense winds aloft.

In a typical implementation, the SODAR can sample along each of the three beams: one is aimed vertically to measure vertical velocity, and two are tilted off vertical and orthogonally oriented to one another to measure the horizontal components of the air’s motion.

SODARs usually provide wind speeds to a maximum height of 200 m above ground level with either 5 or 10 m vertical resolution.