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What is the significance of 45°W in Meteorology? Or is there any significance at all. This is a question about numerical weather prediction. In particular weather forecast/prediction maps. I've noticed on some there is a demarcation at this point on some maps. The imaginary line cuts down the center of Greenland. It is possible it's just for calculation on the GIS. I wondered if anybody had a definitive answer. The map is flat for display purposes not spherical.

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5 minutes ago, Ardista said:

What is the significance of 45°W in Meteorology? Or is there any significance at all. This is a question about numerical weather prediction. In particular weather forecast/prediction maps. I've noticed on some there is a demarcation at this point on some maps. The imaginary line cuts down the center of Greenland. It is possible it's just for calculation on the GIS. I wondered if anybody had a definitive answer. The map is flat for display purposes not spherical.

It's half of 90°, that's all.

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Meridian markers I would have thought .

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