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ADDS - METARs Help Page (4 of 5)
Back to METARs Page OR METARs help
page 5 |
- Flight category definitions:
| Category |
Ceiling |
|
Visibility |
Low Instrument Flight Rules
LIFR* (magenta sky
symbol) |
below 500 feet AGL |
and/or |
less than 1 mile |
Instrument Flight Rules
IFR (red sky symbol) |
500 to below 1,000 feet AGL |
and/or |
1 mile to less than 3 miles |
Marginal Visual Flight Rules
MVFR (blue sky symbol) |
1,000 to 3,000 feet AGL |
and/or |
3 to 5 miles |
Visual Flight Rules
VFR+ (green sky symbol) |
greater than 3,000 feet AGL |
and |
greater than 5 miles |
*By definition, IFR is ceiling less
than 1,000 feet AGL and/or visibility less
than 3 miles while LIFR is a sub-category of IFR.
+By definition, VFR is ceiling greater than or equal
to 3,000 feet AGL and visibility greater than or equal to
5 miles while MVFR is a sub-category of VFR. |
- Cloud coverage symbols:
Automated stations report "CLR" when clouds may exist above
12,000 feet so a square is used to represent this uncertainty whereas
an unfilled circle is used for "SKC" which a human reports the
sky is completely clear overhead. The abbreviation "OVX" is
unofficial but ADDS uses it here to indicate the sky is obscured which
is the case when a METAR reports vertical visibility and no cloud
information.
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