In a manner related to or following the principles of geostrophic balance and motion.
From 'geostrophic' plus '-ally' (adverbial suffix), forming an adverb that describes how something occurs according to geostrophic principles.
When meteorologists say something is 'geostrophically balanced,' they're describing one of nature's most elegant tricks—forces that seem to push in different directions actually create surprisingly predictable, circular motions.
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