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weather · the model over the view

Visibility & fog

Horizontal visibility near the ground as a field, drawn the other way round: clear air shows the map and the colour gathers where the view closes.

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What it shows

Horizontal visibility near the ground as a field, drawn the other way round: clear air shows the map and the colour gathers where the view closes. Fog is under 1 km and mist under 5 km, the definitions airports and drivers use; the readout also gives the dew point.

Where the data comes from

NOAA GFS 0.25° global model (public domain), baked on our server every hour from 24 h ago to 48 h ahead in 3-hour steps; values between grid points are interpolated.

Reading the map

Transparent above about 10 km; slate blue at 5 km, pale grey-blue at 1 to 3 km, near-white in fog under 500 m.

Units Metres under 1 km, kilometres above; the model caps visibility near 24 km.

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