November 24, 2017 - China Launches Weather Satellite

On November 24, 2017, China launched Fengyun-3D, a nearly 2.7-metric-ton weather satellite, aboard a Long March-4C rocket from the Taiyuan Satellite Launch Center. It reached a sun-synchronous orbit at roughly 836 km altitude and joined Fengyun-3C to deliver twice-daily global weather coverage. Its 10 specialized instruments monitor everything from atmospheric temperature to greenhouse gases. Today, it serves users in 121 countries — and there's far more to this mission worth knowing.

Key Takeaways

• China launched the Fengyun-3D weather satellite on November 24, 2017, from Taiyuan Satellite Launch Center at 18:35 UTC.
• A Long March-4C rocket carried Fengyun-3D into a sun-synchronous orbit at approximately 836 km altitude.
• The nearly 2.7-metric-ton satellite carries 10 instruments measuring atmospheric, land, and ocean conditions across multiple spectral bands.
• Fengyun-3D operates in tandem with Fengyun-3C, together providing twice-daily global meteorological coverage.
• China Aerospace Science and Technology Corporation confirmed the mission a complete success following orbital insertion.

What Fengyun-3D Is and Why China Launched It in 2017?

On November 24, 2017, China launched Fengyun-3D (FY-3D), a second-generation polar-orbiting meteorological satellite, from the Taiyuan Satellite Launch Center. You can think of it as China's answer to the U.S. JPSS-1, designed to deliver global weather observations from a polar orbit.

China built FY-3D to strengthen its meteorological capabilities, supporting numerical weather prediction, climate monitoring, and commercial applications like aviation and marine services. The satellite carries advanced instruments for imaging, atmospheric sounding, and greenhouse gas detection, making it a valuable tool for climate diplomacy by sharing global environmental data internationally.

FY-3D also joins FY-3A, FY-3B, and FY-3C in a coordinated network, cutting global forecast update times from six hours down to four. The satellite was lofted into orbit aboard a Long March-4C rocket, marking the 254th mission in the Long March rocket series.

FY-3D was designed and built by Shanghai Academy of Spaceflight Technology, operating in a sun-synchronous near-circular orbit at a nominal altitude of approximately 836 km with an inclination of around 98.75°. Much like TIROS-1 in 1960, which established space-based platforms as essential for modern forecasting, FY-3D represents a continuation of the global shift from ground-based weather observation networks to sophisticated space-borne monitoring systems.

How China's Long March 4C Rocket Delivered Fengyun-3D to Orbit

Carrying Fengyun-3D into orbit, China's Long March 4C rocket lifted off from Taiyuan Satellite Launch Center's LA-9 pad on November 14, 2017, at 18:35 UTC. The three-stage vehicle stands roughly 42 meters tall and delivers around 4,200 kilograms to sun-synchronous orbit.

Its rocket staging sequence began with first-stage burnout and separation approximately 150 seconds after liftoff, followed by successful second and third-stage burns. The YF-21C, YF-24C, and YF-40 engines all burn N2O4/UDMH propellants, and that hypergolic reliability means you get consistent ignition without complex ignition systems.

After the third stage completed its burn, the payload separated into the planned sun-synchronous orbit. China Aerospace Science and Technology Corporation confirmed a complete success, marking the Long March 4C's 21st flight and its first successful mission since the 2016 Gaofen-10 failure. Much like HP's founders who built their first audio oscillator with just $538 in startup capital before growing into a global technology giant, China's space program has expanded from modest beginnings into one of the world's most prolific launch operations. The Long March 4C continued to serve as a reliable workhorse, and by July 2025 its parent family had accumulated 583 total launches across China's Long March series. China's next weather satellite in this series, Fengyun-4C, is planned to launch aboard a Long March 3B rocket on December 26, 2025, at 16:07 UTC.

How Fengyun-3D Differs From Earlier Chinese Weather Satellites?

Fengyun-3D marks a significant leap beyond China's earlier weather satellites, packing upgraded instruments, broader spectral coverage, and faster global data acquisition into a single platform. You'll notice that sensor miniaturization allows it to carry MERSI-2, MWHS-2, MWTS-3, and UV hyperspectral detectors simultaneously, something FY-1 series couldn't achieve.

It captures global data within two to three hours versus one full day for FY-1. Data fusion across microwave, infrared, and optical channels gives you all-weather imaging, atmospheric temperature and moisture profiles, and radiation budget measurements in one pass.

It also fills critical coverage gaps alongside FY-3E, delivering 100% global data every six hours. Earlier satellites lacked atmospheric composition detection and precipitation monitoring—capabilities Fengyun-3D now handles operationally for numerical weather prediction support. FY-3D was launched into orbit aboard a CZ-4C rocket from Taiyuan Launch Center's LC-9, the same launch vehicle and site used for its immediate predecessors FY-3B and FY-3C.

China's geostationary weather satellite program has continued to advance alongside polar-orbiting missions, with the Fengyun-4 series now comprising three satellites, the latest being Fengyun-4C, which carries six onboard instruments including solar and ionospheric monitoring capabilities that extend its utility well beyond traditional meteorological applications. This kind of satellite-based connectivity and remote sensing technology echoes broader efforts to close global coverage gaps, much like Project Loon's stratospheric balloons aimed to deliver internet access to rural and underserved regions before shutting down in January 2021.

Why a Polar Orbit Makes Fengyun-3D So Effective?

Polar orbit consistently puts Fengyun-3D in the right place at the right time, sweeping over both poles every 14 minutes at a 98.7° inclination and 800 km altitude. That orbital coverage means you're getting a continuous global scan, not just snapshots of fixed regions. The sun-synchronous path keeps lighting conditions consistent, so imaging stays reliable across every pass.

You'll also notice how the polar revisit rate tightens the gaps that single-orbit systems leave open. Fengyun-3D pairs with FY-3C to deliver two daily observations, giving forecasters a clearer picture of how storms, clouds, and atmospheric conditions shift over time. At 800 km, the satellite stays close enough to atmospheric features to capture meaningful detail while still covering the entire Earth efficiently. The medium-resolution camera aboard Fengyun-3D includes 25 optical channels, spanning both solar reflective and infrared bands to capture detailed atmospheric data day and night.

The dual-satellite configuration becomes especially valuable at high latitudes, where it can produce nearly 15 high-frequency overpasses per day north of 85°N, supporting continuous monitoring of sea ice distribution and evolution critical for Arctic navigation safety.

What Atmospheric Data Fengyun-3D Was Built to Collect?

When you look at what Fengyun-3D was actually built to do, atmospheric data collection sits at the core of its mission. The satellite handles temperature soundings from the surface up through the stratosphere, giving forecasters precise vertical temperature profiles to feed into numerical weather prediction models.

Atmospheric profiling doesn't stop at temperature though. Humidity retrieval gives you 3-D moisture data across multiple atmospheric layers, including total precipitable water and planetary boundary layer height. The satellite also tracks ozone and trace gases like CO2, CH4, SO2, and NO2.

On top of that, it measures cloud cover, optical depth, cloud-top height and temperature, and precipitation intensity. Together, these capabilities make Fengyun-3D a comprehensive atmospheric monitoring platform that supports both daily forecasting and long-term climate research. Improved atmospheric monitoring tools have become increasingly critical as wildfire-driven weather events, like the 2016 Fort McMurray disaster, demonstrated how rapidly shifting temperature, humidity, and wind conditions can overwhelm emergency response systems. Users can access satellite data by entering North, West, East, South coordinate fields to define a geographic area of interest for retrieval. The satellite was developed by Shanghai Academy of Spaceflight Technology and weighs nearly 2.7 metric tons, reflecting the scale of engineering required to carry this range of instruments into orbit.

Fengyun-3D's 10 Instruments and What They Measure

All that atmospheric data collection runs through a suite of 10 specialized instruments aboard Fengyun-3D, each targeting a specific slice of the measurement spectrum.

You'll find optical sensors like VIRR capturing 10 channels across 0.43–12.5 µm for clouds, vegetation, SST, and aerosols at 1.1 km resolution. IRAS extends that reach with 26 infrared channels, profiling temperature, humidity, and ozone. MERSI-II's 25 channels handle global fire monitoring and surface imaging.

Meanwhile, MWTS and MWHS push into microwave frequencies—50–60 GHz and 183 GHz respectively—profiling temperature and moisture through cloud cover.

These instrument synergies let retrieval algorithms pull coherent atmospheric profiles from overlapping spectral data, even under heavy weather. Together, they transform raw radiance measurements into actionable environmental intelligence across every layer of the atmosphere. This kind of multi-instrument remote sensing approach parallels methods used by orbiting relay spacecraft like Mars Reconnaissance Orbiter, which downlinked data at rates ranging from 500 kilobits per second to 6 megabits per second during planetary science missions. China's later FY-3G satellite, launched in 2023, built on this foundation by introducing a dual-frequency precipitation radar as its primary payload to observe the three-dimensional structure of precipitation systems. FY-3D operates in an afternoon orbit with an equatorial crossing time of approximately 1400 local time at an altitude of 836 km.

Fengyun-3D and Fengyun-3C: Better Together

Fengyun-3D doesn't work alone—it teams up with Fengyun-3C to deliver twice-daily global weather snapshots to Chinese forecasters. Launched in late September 2013, Fengyun-3C flies a mid-morning orbit, while Fengyun-3D covers the afternoon. Together, they close the temporal gaps that a single satellite can't bridge.

After launch, ground controllers adjusted Fengyun-3D's altitude through orbital phasing, synchronizing its passes with Fengyun-3C's for maximum coverage efficiency. Tandem calibration ensures both satellites produce consistent, comparable data across their shared instrument suites, strengthening the reliability of numerical weather prediction models.

You can think of this pairing like the U.S. JPSS-1 constellation model—two satellites, complementary orbits, one unified goal. The result is sharper forecasting, better disaster response, and stronger climate monitoring across every corner of the globe. Much like how the Clinton administration's 2000 decision to end Selective Availability unlocked civilian GPS accuracy and enabled a wave of broader applications, policy and technological milestones often work in tandem to expand the reach and reliability of critical global infrastructure.

How Fengyun-3D Strengthens 7-Day Forecast Accuracy Worldwide?

Accurate 7-day forecasts depend on reliable atmospheric data, and that's exactly where Fengyun-3D delivers. When you integrate its MWTS and MWHS observations into model assimilation systems, forecast errors drop measurably. Sensitivity analyses confirm that MWHS-2 data significantly reduces prediction errors in numerical weather models, improving medium-range outlooks up to seven days ahead.

Fengyun-3D's precise calibration makes this possible. Its MWTS channels maintain biases under 1 K, while MWHS delivers accurate humidity profiles verified against GPS radio occultation data. You get all-weather microwave observations that overcome cloud interference, ensuring continuous data input regardless of conditions. Independent research has confirmed this calibration accuracy through cross-calibration with GPS radio occultation, providing an objective validation method that strengthens confidence in the satellite's measurement reliability.

The result is sharper global monitoring of temperature and humidity profiles, giving forecasters the reliable atmospheric intelligence they need to strengthen forecast sensitivity and improve weather prediction worldwide. Much like Canada's Anik A1 satellite demonstrated in 1974 that a single orbital platform could deliver reliable communications across vast and remote territories, Fengyun-3D proves that one well-designed satellite can produce measurable improvements in data quality on a global scale. Fengyun-3D operates alongside Fengyun-3E and Fengyun-3G as part of a broader low-orbit constellation designed to maximize global observation coverage and enhance the accuracy and timeliness of numerical weather forecasting.

Why Fengyun-3D's Data Extends Beyond Chinese Borders?

Beyond Chinese borders, Fengyun-3D's data reaches users in 121 countries and regions, including 85 nations along Belt and Road Initiative routes.

You'll find this international collaboration embedded in real-world applications—Europe and the US use the data for assimilation, short-term precipitation forecasting, and marine monitoring.

China's approach to data diplomacy is practical and measurable.

In 2021 alone, global users placed over 2,000 service orders and downloaded 9 million files totaling 60TB through the FENGYUN Satellite Data Service portal.

Beyond downloads, more than 1,400 professionals from 92 countries have received training in Fengyun satellite technologies.

Integrated with US NOAA and European polar-orbiting satellites, Fengyun-3D doesn't operate in isolation—it actively completes the global weather picture, delivering 70 products across atmospheric, land, and ocean parameters. When disasters strike, China's Emergency Support Mechanism has been activated over 20 times in a single year to deliver dedicated monitoring reports and data to affected countries.

The satellite data portal supports area selection and coordinate-based queries, with grid resolution outputs calculated at 4000M resolution to serve global users accessing environmental monitoring products.