SEATTLE–(BUSINESS WIRE)–Large thunderstorm clusters cause billions in damage and supply much of the nation’s warm-season rain, yet forecasters still struggle to see them coming more than a week out. Planette AI today announced the launch of DL4MCS, a Genesis Mission Phase I project supported by the U.S. Department of Energy (DOE) to improve subseasonal — roughly 7 days to six weeks ahead — forecasting of these storms, known as mesoscale convective systems (MCS), across the continental United