Training Guide in Surface Weather Observations - Multiple Choices

Obscurations that stand alone, i.e., do not have a qualifier (descriptor) attached, are reported only when the
visibility is less than 7 miles or deemed operationally significant by the observer. Volcanic ash (VA) is
always reported when observed regardless of the visibility.
Patches of Fog: Indicates that patches of fog Partial Fog: Indicates that a substantial part of the
randomly cover the station. station is covered by fog while the remainder is clear
of fog.
10SM BCFG
4-6
10SM PRFG