This could be one of the stormiest Christmases in recent memory. There’s an 80% chance downtown Los Angeles will get 2 or more inches of rain Tuesday through Christmas.

NOAA is using those traditional forecasting models as frameworks for its new AI forecasting systems. The agency has estimated that the AI programs will require between 91% and 99% less computing resources than traditional models, while at the same time extending the life of a particular forecast, potentially by as much as 18 or 24 hours.