In what time standard is the time of observation entered in column 2 for most SAWRS?

The time of observation for most Surface Automated Weather Reporting Systems (SAWRS) is recorded using Coordinated Universal Time (UTC). This standard is essential for ensuring consistency and is widely used in aviation and meteorological reporting around the globe.

Using UTC eliminates confusion caused by local time variations, such as Daylight Saving Time and local time zones, making it easier for pilots, meteorologists, and other users to interpret weather data and coordinate safety measures. This standardization is especially important for international operations where multiple time zones may be involved.

Local Standard Time, Daylight Saving Time, and Greenwich Mean Time (which is similar to UTC but not commonly used in this context) lack the clarity and uniformity that UTC provides, thus rendering those options less suitable for official weather reporting practices.