Which statement about the Terminal Aerodrome Forecast (TAF) is correct?

The correct statement about the Terminal Aerodrome Forecast (TAF) is that the designation "SKC" during the valid period indicates no significant weather and that the sky is clear. In TAF reporting, "SKC" stands for "Sky Clear," which signals that there are no significant obstacles to visibility, such as clouds or adverse weather conditions. This terminology is crucial for pilots and flight planners because it suggests optimal flying conditions regarding visibility and weather.

The other options do not accurately reflect TAF conventions. For instance, wind direction is part of the TAF data but does not necessarily indicate that visibility would be 6 statute miles. The phrase "implies surface winds are forecast to be greater than 5 KTS" is misleading because TAFs specifically report expected surface winds, and there's no stipulation on what the forecasting parameters must meet unless explicitly noted. Similarly, visibility forecasts in TAFs can vary widely, and stating that visibility is forecast to be less than 5 statute miles does not accurately represent the standard reporting conventions used in TAFs, which should include explicit forecasts rather than assumptions.