What does "VIS 1/2V2" signify in a METAR?

The notation "VIS 1/2V2" in a METAR report indicates that visibility is variable between one-half mile and two miles. In this context, "VIS" stands for visibility, while "1/2" represents the lower limit of visibility (one-half mile) and "V2" represents the upper limit (two miles). This description is essential for pilots and air traffic controllers as it provides crucial information about the varying visibility conditions that may affect flight operations.

Understanding this notation helps in assessing whether weather conditions may impact takeoff, landing, and overall safety. By recognizing that visibility can fluctuate between those two specific distances, pilots can make informed decisions regarding their approach and maneuvers.

The interpretation of the other options does not accurately reflect the METAR coding conventions. For instance, while "visibility at one-half mile" accurately identifies part of the range, it does not capture the variable nature suggested in the original statement. Similarly, indicating visibility measured at two miles ignores the critical aspect of the variability presented. Lastly, "variable wind conditions" pertains to a different aspect of weather reporting and does not apply to visibility readings. Therefore, option A accurately describes the meaning of "VIS 1/2V2" within the context of