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In this particular map

enter image description here

from SkyVector, what are the meanings of the different colored circles, and for the different amounts of 'fill-in'?

  • It's obvious by hovering over them, that they are weather stations, as the weather info will pop-up, but there doesn't seem to be anything (to my untrained eye) about the weather pop up that would indicate a need for the different colors.
  • It's also obvious that the color doesn't indicate something permanent about the station, as last Friday, there were large swathes of different colors across the USA, while today almost everything is green.
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1 Answer 1

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Colors

At present1, they mean (image source):

Color codes

For more details, please see this description.

Fill-ins

These are called sky/cloud coverage.

Sky/Cloud Covers
Image Source

1 From SkyVector:

The color is controversial because the FAA is making the NWS swap the colors for VFR and MVFR. When the new aviationweather.gov becomes the current aviationweather.gov, we'll change our colors to match.

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    $\begingroup$ Fantastic! Thank you. The SV link you posted wasn't particularly obvious from within SV... $\endgroup$
    – FreeMan
    Mar 16, 2015 at 16:44
  • $\begingroup$ You should add that the "fill in" is sky cover. $\endgroup$
    – casey
    Mar 17, 2015 at 0:26

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