International Science Working Groups – CGMS – Website

Annual and executive panel meeting of GSICS

CGMSadmin — Wed, 08 Jul 2026 13:25:02 +0000

The annual and executive panel meeting of the Global Space-based Inter-Calibration System (GSICS) will be held on 15-19 March 2027 at EUMETSAT in Darmstadt, Germany.

More information to be available here.

ITSC-26

CGMSadmin — Tue, 17 Mar 2026 07:15:12 +0000

The next ITWG meeting, ITSC-26, will be held on 4-10 March 2027 in Tsukuba, Japan.

More information on the meeting is available on the ITWG website.

18th workshop of the International Winds Working Group (IWW18)

CGMSadmin — Tue, 10 Feb 2026 18:18:15 +0000

The 18th workshop of the International Winds Working Group (IWW18) will be held on 8-12 March 2027 at EUMETSAT.

More information to be available here.

Annual and executive panel meeting of the Global Space-based Inter-Calibration System (GSICS)

CGMSadmin — Tue, 10 Feb 2026 18:13:37 +0000

The annual and executive panel meeting of GSICS will be held on 23-27 March 2026 in Ottawa, Canada.

More information is available here.

12th workshop of the International Precipitation Working Group (IPWG-12)

CGMSadmin — Tue, 10 Feb 2026 14:00:09 +0000

The 12th workshop of the International Precipitation Working Group (IPWG-12), will be held on 7-10 July 2026 in Kraków, Poland.

More information is available here.

3rd Polarimetric Radio Occultation Workshop

CGMSadmin — Mon, 07 Jul 2025 07:32:51 +0000

The Third Polarimetric Radio Occultation Workshop will take place on 10-12 November 2025 at EUMETSAT HQ in Darmstadt, Germany.

Standard RO products such as bending angle profiles are routinely assimilated into weather models for operational Numerical Weather Prediction (NWP). The positive impact to forecasts of temperature and winds when RO data are included in the suite of observations ingested into data assimilation (DA) systems has been demonstrated.

Polarimetric RO (PRO) enhances standard RO by receiving the GNSS signals with a dual-polarization RO receiver. In addition to the capabilities of the conventional RO, PRO can provide an indication of precipitation at each vertical level. This is achieved by measuring the cross-polarisation induced by propagation through an aspherical precipitation media. The vertical structure of the hydrometers, at a few hundreds of meter vertical resolution, emerges as the near-horizontal integral of the specific differential phase shift along the RO link. This added capability offers unique forecast model diagnostics and a potential to advance the assimilation of satellite data in precipitating conditions. Furthermore, these observations also provide and observations for investigating the thermodynamic environment in and near precipitation, and assumptions underlying microphysical parameterisations used by operational NWP forecast models.

The PRO concept has been flight-proven via the Radio Occultations and Heavy Precipitation (ROHP) experiment, operating onboard the Spanish PAZ satellite since May 2018. Since 2023, the number of PRO has been augmented with data from Spire and PlanetiQ cubesats.

This third workshop follows on to the “2nd GNSS Polarimetric Radio Occultation workshop” from 2023. It represents a forum for addressing multiple uses and applications that have been studied in the seven years that PRO data have been available to various NWP centers and research entities, align the presentation of these results, and prepare recommendations for meteorological, space and research organisations (e.g., CGMS agencies, the EUMETSAT ROM SAF). The workshop will focus on presentations and discussions in the following areas:

Status of current and future polarimetric-capable RO observations
Precipitation, convection, extreme precipitation events
Microphysical parameterisation schemes
NWP and climate model evaluation
RO data assimilation
Assimilation of rain-impacted microwave radiances, eg GPM, ATMS, future MetOp, etc.
Recommendations to space agencies and data providers
ROM SAF consultation process

The first two days of the meeting will feature presentations and discussions, while the final day will include a plenary session dedicated to consolidating PRO findings and finalising the report and recommendations for CGMS, as well as the ROM SAF consultation on PRO activities. In-person participation is strongly encouraged, though remote access will be available. A detailed agenda will be provided after registration closes.

WGClimate-22 & GHG Task Team

CGMSadmin — Thu, 12 Dec 2024 08:43:11 +0000

The WGClimate-22 and the GHG Task Team meetings will be held in Harwell, UK, from 11-13 February 2025.

More information is available here.

11th workshop of the International Radio Occultation Working Group (IROWG-11)

CGMSadmin — Mon, 25 Nov 2024 15:37:12 +0000

The 11th session of the International Radio Occultation Working Group Workshop, IROWG-11, will be held on 10-16 September 2026 at Seggau Castle in Austria.

More information is available here.

ROMEX-2 workshop, 25-27 February 2025, at EUMETSAT

CGMSadmin — Mon, 25 Nov 2024 15:31:49 +0000

The second ROMEX workshop, ROMEX-2, will be hosted by EUMETSAT on 25-27 February 2025 in Darmstadt, Germany.

More information is available here.

4th International Cloud Working Group meeting (ICWG-4)

CGMSadmin — Mon, 25 Nov 2024 15:19:41 +0000

The 4th session of the International Cloud Working Group meeting (ICWG-4) will be jointly hosted by the KMA National Meteorological Satellite Center and Ewha Womans University in Seoul, Republic of Korea, during the week of 19-23 October 2026. More information can be found on the meeting’s webpage.