What is the encoding for total obscuration with a vertical visibility of 500 feet?

The correct encoding for total obscuration with a vertical visibility of 500 feet is represented as VV500. This notation indicates that vertical visibility (VV) is 500 feet, meaning that when there is total obscuration, such as dense fog or heavy precipitation, the observer cannot see above a height of 500 feet.

In aviation weather reporting, the "VV" prefix specifically denotes vertical visibility, contrasting with other potential notations that might indicate different types of measurements or conditions. The number following the "VV" indicates the height in feet.

In this context, while the other options may represent other types of observations or measurements, they do not adhere to the correct format for capturing total obscuration with vertical visibility. Options like VV005 and 500VV do not accurately represent the condition being described, either by using incorrect formatting or by failing to convey the intended measurement of vertical visibility properly. Thus, recognizing the appropriate syntax of VV followed by the numeric value for vertical visibility is essential in understanding and correctly reporting total obscuration in weather observations.