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The Hyperspectral Microwave Sounder (HyMS), developed by Spire Global Ltd and STFC RAL Space, was launched on January 11, 2026, from Vandenberg Space Force Base in California. This shoebox-sized sensor aims to improve weather forecasting by providing more frequent and detailed atmospheric measurements using microwave technology, which can penetrate clouds.

Traditional meteorological satellites are large and expensive, typically revisiting locations once daily. HyMS offers a smaller, affordable alternative that enables multiple sensors for better atmospheric sampling. Spire plans to deploy HyMS across a fleet of satellites to enhance data availability and support global weather agencies, especially in remote areas.