A "grid node" refers to a point or location in a grid system. It can represent a specific point where information or data is stored, processed, or transferred within a grid network. Full definition
In this particular case the best grid node is 25 km away (16 miles). (surf-forecast.com)
New kinds of forecasts available in the demonstration platform help transmission system operators calculate precisely how much wind and solar power will be fed into which grid nodes. (sciencedaily.com)
The wave model does not forecast surf and wind right at the coast so we have chosen the optimum grid node based on what we know about Playa Grande. (surf-forecast.com)