What is 'heavy rain' classified as in aviation weather terms?

In aviation weather terminology, 'heavy rain' is classified as rainfall exceeding 0.3 inches per hour. This classification is important for aviation operations because heavy rain can significantly impact visibility, runway conditions, and aircraft performance. Understanding rainfall rates helps pilots and other aviation professionals assess weather conditions and make informed decisions regarding flight safety.

The threshold of 0.3 inches per hour serves as a critical marker for identifying heavy precipitation, distinguishing it from moderate or light rain. This standard is derived from the need to have clear definitions in meteorological practices, specifically within aviation contexts, ensuring consistency and safety in operations.