Weather Stream’s GEMS2-Amethyst Satellite Achieves First Light, Delivering Global Atmospheric Data from Orbit

Next-generation commercial microwave radiometer begins returning temperature, humidity, and precipitation observations from space

BOULDER, Colo--(BUSINESS WIRE)--Weather Stream Inc. today announced that its GEMS2-Amethyst satellite has achieved first light, collecting global atmospheric observations from orbit. Launched March 30 aboard SpaceX's Transporter 16 rideshare mission from Vandenberg Space Force Base, GEMS2-Amethyst is the latest iteration of the company's Global Environmental Monitoring System (GEMS) meteorological satellite mission.

GEMS2-Amethyst carries a dual-band passive microwave radiometer designed and built in-house by Weather Stream’s Boulder, Colorado team. The instrument measures three-dimensional atmospheric temperature and humidity profiles across a nearly 2,000-kilometer swath, providing near global coverage approximately every 12 hours. Integrated with a satellite bus from Denmark-based GomSpace, the satellite reached a sun-synchronous orbit at nearly 600 kilometers with a projected operational life of 3-5 years. Payload calibration activities are now underway ahead of data validation and delivery.

The mission builds on the success of Weather Stream’s GEMS1 satellite, which in 2019 became the first commercial microwave radiometer to operate in orbit. While GEMS1 sensed temperature alone, GEMS2-Amethyst adds sensitivity to humidity and precipitation, expanding the company’s ability to fill critical gaps in global weather observations.

“Weather affects everything. From forecasting severe storms to supporting military operations to helping the insurance industry assess risk, the observation gaps we are filling with GEMS2-Amethyst touch decisions that billions of people depend on every day,” said Michael Hurowitz, CEO of Weather Stream.

GEMS2-Amethyst data supports applications ranging from weather forecasting and natural disaster response to defense operations, climate research, and commercial use cases including parametric insurance and aviation planning. Weather Stream delivers this data to government and commercial customers worldwide.

Weather Stream continues advancing its GEMS constellation, with plans to expand its commercial passive microwave capabilities through future GEMS2 missions, alongside advanced sensor development and select strategic partnerships. Together, these efforts mark a new chapter of commercial growth for the company. Organizations interested in collaborating or learning more can visit weatherstream.com.

About Weather Stream

Weather Stream Inc. is a Boulder, Colorado-based satellite operator that designs, builds, and operates proprietary microwave radiometer instruments for global weather and climate observation. Founded from pioneering research at the University of Colorado, the company delivers weather data as a service through its GEMS satellite constellation, providing actionable intelligence for government, defense, commercial, and scientific applications worldwide.