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For sailboat racing I care about “micrometeorology” - e.g. things like which of two slightly different courses only 1/10th of a mile apart to the same destination will be windier 45 minutes from now?

Amazingly, these models are starting to be able to actually predict that, but I agree that not a lot of people care about that level of detail.

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It depends on the type of sailing and where the race will be taking you. The participants in a race such as the Vendée Globe [0] are almost certainly using the likes of synoptic scale models like the GFS and ECMWF to plan their routes.

[0] https://en.wikipedia.org/wiki/Vend%C3%A9e_Globe

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