VA may be reported with any visibility. Weather is reported in order of decreasing dominance. Automated stations can only report RA, SN, UP, FG, BR, FZFG, HZ, and SQ without augmentation. See table on reverse for more information on qualifiers and weather phenomena. All layers are considered opaque.
Altimeter is prefixed with an A indicating altimeter in inches of mercury.
Additive and Automated Maintenance Data. The following describes the order in which remarks are reported. 6 second lowest broken layer SKC is reported at manual stations when no clouds are observed. CLR is reported at automated stations when no clouds are detected at or below 12000 feet. Surface observations are taken simultaneously all across the country so that forecasters can depend on a new set of observations each hour.