When visibility is greater than 6 SM on a TAF, how is it expressed?

When visibility exceeds 6 statute miles (SM) in a Terminal Aerodrome Forecast (TAF), it is expressed with a “P” preceding the visibility distance, such as “P6SM.” This indicates that the visibility is greater than 6 statute miles, providing pilots with an understanding that conditions are likely to be better than the specified minimum threshold.

Using "P" signifies "greater than," which is important for flight planning and operations, as it informs pilots that they can expect favorable visual flight conditions. In contrast, other formats lack the clarity provided by “P6SM” regarding visibility exceeding 6 SM. Consequently, the expression "P6SM" is the standard terminology used within aviation weather forecasts to succinctly communicate this information to pilots.