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What is the difference between true wind vectors and regular wind vectors?

April 26, 2017regular vectors wind

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What is the difference between true wind vectors and regular wind vectors?

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A. Some gridded data is produced with the wind components being relative to the model grid instead of the earth. The true wind vectors are rotated from the grid projection to actual (true) wind direction. For non-projected (i.e., lat/lon grids), grid relative is the same as true.