True when visibility is reported as less than the stated value (M prefix in US METARs).
True when visibility is reported as greater than the stated value (P prefix, e.g. P6SM in TAFs).
OptionalvisibilityPrevailing visibility in meters (ICAO format).
OptionalvisibilityPrevailing visibility in statute miles (US format).
Prevailing visibility as reported in a METAR, SPECI, or TAF forecast group.