What is the definition of a "WA" Airmet?

A "WA" Airmet, or Weather Advisory Airmet, specifically refers to a special report of unfavorable weather conditions that could impact flight safety. This type of Airmet is issued to alert pilots about certain weather phenomena, such as turbulence, icing, or low visibility, which could affect aviation operations, particularly for smaller aircraft.

The reason this definition is correct is that the purpose of a "WA" Airmet is to provide timely and crucial information to pilots, aiding them in making informed decisions regarding flight safety. It emphasizes significant weather impacts that are not severe enough to warrant a warning but still pose hazards to flight operations.

The alternative options do not accurately reflect the scope or purpose of a "WA" Airmet. For example, a report of normal weather conditions or a routine forecast for clear weather does not address the potential hazards that a "WA" Airmet is designed to warn about. Similarly, a warning for high visibility conditions diverges from the actual intent of the advisory, which is focused on communicating potentially adverse weather impacts rather than conditions of safety and clarity.