Microsoft has recently rolled out a significant upgrade to its foundational Earth system model, Aurora 1.5. This iteration brings in 22 novel weather variables pertinent to energy, agriculture, transportation, and climate-related risks. It integrates hourly temporal resolution and probabilistic ensemble forecasting features, offering heightened precision and more comprehensive data support for medium-range weather forecasting. Trials have demonstrated that the median track error rate of Aurora 1.5 in forecasting Hurricane Helene's path has diminished by one-third relative to prior models, attaining an accuracy rate of 88.9% and surpassing the European Centre for Medium-Range Weather Forecasts model. The model is now available as open-source, catering to research institutions, governmental bodies, and social organizations, with plans to incorporate it into commercial offerings like Microsoft Weather.