What is the significance of the 'A2980' in a SPECI report?

The 'A2980' in a SPECI report refers specifically to the altimeter setting, which is an essential piece of information for pilots and air traffic controllers. The 'A' denotes that this information pertains to the altimeter, and the number that follows represents the atmospheric pressure adjusted to sea level, expressed in inches of mercury (inHg).

This value is crucial for ensuring that aircraft are accurately calibrated for altitude when flying. An incorrect altimeter setting can lead to altitude misjudgments, which could potentially result in dangerous situations such as unintended altitude losses or collisions with terrain. Therefore, the information presented by 'A2980' plays a direct role in maintaining safety and efficiency in flight operations, making it a key component of the overall data provided within a SPECI report.