National Weather Service Picks Google Cloud for Forecasting Supercomputer Shift

The National Weather Service has selected Google Cloud as the primary high-performance-computing provider for a move that will take the backbone of its weather-modeling operations out of agency data centers. The shift is meant to give NWS more flexibility as AI-based forecasting develops, with a full-scale cloud environment targeted for the start of 2027.

The system being moved is the Weather and Climate Operational Supercomputing System, or WCOSS. NWS currently relies on two operational supercomputers in on-premises data centers to run the weather models that support its forecasts. Agency officials are treating the expiration of that equipment as an opening to modernize rather than simply replace it.

A different computing shape for AI forecasts

Traditional numerical weather prediction and AI prediction have different computing footprints, according to NWS central operations director David Michaud. An on-premises system has a finite set of compute resources; cloud infrastructure can, in the agency’s view, shift the balance of those resources more quickly as needs change, including during severe weather.

That flexibility does not mean NWS is abandoning physical simulation. The agency expects future forecasting systems to combine traditional physics-based models with AI models, seeking the strengths of both approaches. Its officials also caution that AI weather prediction remains at an early stage and can be limited in extreme-weather situations.

Existing models gain a more natural home

NWS already runs AI-based models: AIGFS, a global forecasting model; AIGEFS, a global ensemble model that provides probabilistic information; and Hybrid-GEFS, which combines a traditional numerical model with AI. Some of that AI-model work was developed in Google DeepMind’s cloud environment before being deployed to NWS’s existing on-premises infrastructure.

Projects the cloud environment could support

• AI and hybrid forecasting models whose compute needs differ from conventional numerical models.
• The Warn-on-Forecast System, designed to improve warnings for tornadoes, severe thunderstorms, and flash floods.
• A path from demonstration to operations for systems designed to run in the cloud.

Warn-on-Forecast has been operating in demonstration mode, but NWS Meteorological Development Laboratory director Richard Bandy said the lack of an operational cloud environment had complicated putting it into production. Moving the broader production suite to the cloud gives the agency a path toward operationalizing projects built for that setting.

A phased migration, not an immediate switch

NWS plans to reduce risk with a smaller early-access environment before testing performance at final scale. The early-2027 target is therefore a milestone for infrastructure readiness, not evidence that every cloud-designed forecasting project will be operational by then. The immediate test is whether the agency can validate performance while moving a system that underpins its model suite.