The UK’s Met Office says it has completed a phased move to what it calls the world’s first fully managed cloud supercomputer for weather and climate science. A cloud supercomputer puts large computing systems in remote data centers and makes their processing power available through a managed service. Microsoft manages this one for the agency. Weather agencies use numerical weather prediction, computer simulations based on atmospheric physics, to calculate how conditions may change. A separate archive stores observations and model data used by forecasters and researchers.The completed platform has around 1.8 million processor cores and performs approximately 60 quadrillion calculations per second, according to the Met Office. It processes more than 50 billion weather observations each day. The agency says the expanded capacity will support higher-resolution climate models and larger ensembles, which run multiple simulations to test different possible conditions.More computing capacityThe program was delivered in phases to keep national forecasting services running, according to the Met Office announcement. Phase one swapped in a like-for-like replacement for the old supercomputer. Phase two added capacity for weather forecasting, climate research and scientific development.The project also moved the Met Office’s Managed Archive Storage System (MASS) to the cloud, replacing its previous archive in Exeter. The archive supports operational forecasting, research and development, and the Met Office says it was designed for growing volumes of weather and climate data.Weather models combine observations from satellites, weather stations, aircraft and ships to establish current atmospheric conditions. Supercomputers simulate how air, moisture and heat move. More capacity allows higher-resolution models and more scenarios, but does not itself prove that forecasts are more accurate.Operational forecasting had already moved to Microsoft’s Azure cloud in May 2025, according to Microsoft’s account. In a March 2026 year-one update, the Met Office said it had completed its first full year running the system in the cloud. November’s announcement completes the wider program, not the system’s initial launch.Benefits and open questionsThe Met Office says the program is on track to deliver £11.3 billion in socioeconomic benefits. It lists potential benefits across aviation, defense, land transport, emergency response, flood forecasting and energy resilience. The announcement doesn’t say what time period the estimate covers or how it was calculated.The announcement labels the service “more resilient and energy efficient” in a heading, but gives no energy-use figures or measured carbon savings for the completed transformation. A February 2025 source describes free-air cooling and projected emissions savings for the earlier upgrade. Those figures predate the November completion announcement and do not establish the new phase’s energy performance.The sources contain no before-and-after forecast-accuracy figures or independent technical evaluation of the completed phase. Microsoft’s Erin Chapple, a corporate vice president, said in the year-one update that “compute power alone does not deliver better forecasts.”The Met Office says the extra capacity is improving how its models represent rainfall and allows more observational data into forecasts. Further upgrades will come in careful, evidence-backed steps, according to the year-one update.