In a METAR report, what does REFZRA indicate?

In a METAR report, the term "REFZRA" indicates freezing rain. This term is a combination of elements that inform pilots and meteorologists about specific weather conditions. “REF” stands for "refreezing," which implies that the precipitation has begun as rain but is freezing upon contact with surfaces due to temperatures being at or below the freezing mark. The "ZRA" component signifies that it is rain that is freezing as it falls, leading to a layer of ice on surfaces.

Understanding the context of freezing rain is crucial for aviation as it can create hazardous conditions for aircraft during takeoff, landing, and flight operations due to ice accumulation on wings, engines, and other critical surfaces. Recognizing and interpreting such METAR code allows pilots to make informed decisions about safety and weather-related risks during their flights.