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What does a partially filled weather status circle signify on Skyvector.com ?

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It's an indication of how much of the sky is under that weather condition: IMC, marginal VMC, VMC.

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    $\begingroup$ what does a half-filled green circle mean then? half of the sky is VFR and the other half is what? $\endgroup$ – GJ. Oct 21 '19 at 11:22
  • $\begingroup$ Not 100% sure. I was looking at the weather reports that are pulled up when you hover over a circle, and the reports don't look that different between 1/4 green, 1/2 green, 3/4 green. Could be how much of the area is under a high ceiling. So VMC, but not fully clear skies. $\endgroup$ – CrossRoads Oct 21 '19 at 11:56
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    $\begingroup$ Actually the colour indicates condition (green = VMC, blue = Marginal VMC, red = IMC) and the fraction is cloud coverage (empty = clear, full = overcast, fractions in between). It is taken from 1800wxbrief.com. $\endgroup$ – Jan Hudec Oct 21 '19 at 19:29
  • $\begingroup$ @GJ., it means VFR (green), partly cloudy (1/2). $\endgroup$ – Jan Hudec Oct 21 '19 at 19:31
  • $\begingroup$ 1/4-full circle would mean 1/4 clouds, or 3/4 clouds? $\endgroup$ – GJ. Oct 21 '19 at 21:04

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