WindBorne, a weather balloon startup, has raised $15 million in Series A funding led by Khosla Ventures, with additional support from Pear, Convective Capital, and Footwork VC. The company, founded by Stanford alumni and a PearX S19 alum, has developed proprietary balloon hardware and autonomous flight software that enables them to collect unique atmospheric data. This data, combined with historical data, is used to train AI-based weather models, which are proving to be more accurate and efficient than traditional methods. The advancements come at a crucial time, as NOAA predicts an especially busy hurricane season this summer. WindBorne's technology, alongside efforts from major players like Google DeepMind, is seen as a significant step forward in the fight against climate change.