High-resolution global atmospheric model erases 'popcornlike' rain

A new weather model from the University of Tokyo uses a grid spacing of only 220 meters, much finer than the usual tens or hundreds of kilometers. This higher resolution removes unrealistic “popcornlike” bursts of heavy rain that appear in older simulations. The improved model gives more accurate predictions of extreme local weather across the globe.

Global climate and weather forecasting use predictive models that divide Earth's atmosphere into a grid, with each section typically covering tens to hundreds of kilometers. Now a new model, run by a team at the University of Tokyo, has narrowed this grid spacing to just 220 meters (720 feet). This higher resolution eliminated instances of "popcornlike" rain—bursts of heavy rain that appear in simulations but not in real life—providing more accurate predictions of extreme local weather from a global model.

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