When you click on an airport tag it usually is shown in white (or green for ATC). However in bad conditions some tags are blue or red. I assume red means IFR conditions, but what is blue? Is it MVFR?
I wonder the same thing. Maybe it means fog.?.?
Yes that could be it - leading to MVFR conditions.
Marginal Visual Flight Rules which apparently means ceiling at 1,000 to 3,000 feet AGL and/or visibility at 3 to 5 miles.
This should help. Straight from Wikipedia, Flight categories in the U.S.
METARs can be expressed concisely using so-called aviation flight categories, which indicates what classes of flight can operate at each airport by referring to the visibility and ceiling in each METAR. Four categories are used in the U.S.:
VFR > 5 mi and > 3000 ft AGL
Marginal VFR Between 3 and 5 mi and/or Between 1,000 and 3,000 ft AGL
IFR 1 mi or more but less than 3 mi and/or 500 ft or more but less than 1,000 ft
Low IFR < 1 mi and/or < 500 ft
METAR WX codes
METAR abbreviations used in the WX section. Remarks section will also include began and end times of the weather events.
Codes before remarks will be listed as “-RA” for “light rain”. Codes listed after remarks may be listed as “RAB15E25” for “Rain began at 15 minutes after the top of the last hour and ended at 25 minutes after the top of the last hour.”
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