WSF-M will be a Sun-synchronous low Earth orbit (LEO) satellite with a passive microwave imaging radiometer instrument and hosted furnished Energetic Charged Particle (ECP) sensor.

[5] WSF-M was launched in April 2024 on a Falcon 9 Block 5 rocket from Vandenberg Space Force Base.

[1][2] WSF-M will be the first satellite in the Weather System Follow-on (WSF) program.

However, when that system faced delays and funding issues, the White House cancelled it and instituted the WSF program.

[6] WSF-M is designed to mitigate three high priority U.S. DoD Space-Based Environmental Monitoring (SBEM) gaps: ocean surface vector winds, tropical cyclone intensity and LEO energetic charged particles.