What is the function of an altimeter in aviation weather reporting?

The function of an altimeter in aviation weather reporting is to measure altitude by comparing internal and external air pressure. An altimeter operates based on the principle that atmospheric pressure decreases with an increase in altitude. By using a barometric pressure measurement, it calculates the aircraft's elevation above sea level. This is critical for pilots, as it helps them maintain safe flight levels, avoid obstacles, and ensure safe takeoffs and landings.

In aviation, accurately determining altitude is essential for navigation and safety, making the altimeter a vital instrument. While other instruments measure wind speed, humidity, or temperature, they serve different purposes and do not fulfill the role of measuring altitude, which is specifically what an altimeter is designed to do.