MeteoSwissRadar

MeteoSwissRadar
Name	MeteoSwissRadar
Caption	Weather radar network operated by the Federal Office of Meteorology and Climatology
Formed	1990s
Headquarters	Zürich
Jurisdiction	Switzerland
Parent agency	Federal Office of Meteorology and Climatology (MeteoSwiss)

MeteoSwissRadar

MeteoSwissRadar is the weather radar network operated by the Federal Office of Meteorology and Climatology, known as MeteoSwiss. The network provides real‑time precipitation and storm monitoring across Switzerland and adjacent regions, supporting civil protection, aviation, hydrology, and forecasting. It integrates radar hardware, signal processing, data assimilation, and dissemination systems to produce a suite of operational products used by national and international institutions.

Overview

The network is managed by the Federal Office of Meteorology and Climatology MeteoSwiss and is integrated with national services such as the Swiss Federal Railways, Federal Office for Civil Protection (Switzerland), and the Federal Office for the Environment (Switzerland). It contributes to transnational collaborations with institutions like the European Organisation for the Exploitation of Meteorological Satellites, the World Meteorological Organization, and the European Centre for Medium-Range Weather Forecasts. Key locations include radar sites near Payerne, Sion, and Zurich Airport, and data are disseminated to stakeholders including Swiss Re, SRF (Swiss Radio and Television), and regional emergency services.

Radar Network and Technology

The radar network comprises multiple C‑band and S‑band Doppler radars equipped with polarimetric capabilities, similar to systems used by agencies such as the Met Office and the Deutscher Wetterdienst. Hardware vendors and research partners include firms and laboratories that collaborate with institutions like the Paul Scherrer Institute and the ETH Zurich. Antenna sites are sited to optimize coverage over alpine terrain and valleys, reducing blind zones near mountain shadowing that affect stations such as those in the Alps and the Jura Mountains. The system architecture combines phased rotation scanning strategies, pulse compression, and dual‑polarization measurements to estimate reflectivity, radial velocity, and differential phase. Signal processing chains leverage algorithms developed in cooperation with academic groups from University of Bern, University of Zurich, and international teams at University of Reading and MIT.

Data Products and Services

Products include instantaneous radar reflectivity mosaics, composite precipitation rate maps, storm motion vectors, hail probability fields, and quantitative precipitation estimates (QPE). Derived datasets feed nowcasting tools used alongside outputs from numerical weather prediction centers such as Météo‑France, the European Centre for Medium-Range Weather Forecasts, and regional models run by MeteoSwiss itself. Dissemination channels serve operational users via secure feeds and public portals used by media outlets like 20 Minuten and research groups at institutions such as EPFL. Specialized services are provided to aviation stakeholders at Zurich Airport and to hydrological modelling centers managing basins like the Rhône and Aare.

Operational Use and Applications

Operational users include civil protection authorities in cantons such as Valais and Graubünden, as well as alpine rescue services including REGA (Swiss Air‑Rescue). The radar outputs underpin flood forecasting for river systems managed by the Federal Office for the Environment (Switzerland), road safety alerts coordinated with the Swiss Federal Roads Office, and event planning for organizers of major sports events like the Jungfrau Marathon and the Lausanne Marathon. Research collaborations apply radar data to convective studies connected with programs funded by the Swiss National Science Foundation and European research frameworks including Horizon 2020.

Accuracy, Limitations, and Calibration

Accuracy of precipitation retrievals depends on radar frequency, path attenuation, beam blockage in complex terrain, and microphysical assumptions; these issues are similar to those documented by NASA remote sensing programs and the European Severe Storms Laboratory. Calibration is routinely performed using ground truth from rain gauge networks operated by cantonal agencies, reference disdrometer measurements at research sites like Payerne Observatory, and intercomparison campaigns with microwave radiometers and satellite platforms such as MetOp and Sentinel. Systematic biases are mitigated through real‑time attenuation correction, polarimetric calibration, and quality control methods developed jointly with groups at Zürcher Hochschule für Angewandte Wissenschaften and University of Innsbruck.

History and Development

The radar network evolved from early single‑site installations in the late 20th century to a coordinated, multi‑site polarimetric network. Development milestones include upgrades to Doppler and polarimetric capability inspired by programs at NOAA and collaborative projects with neighboring services such as Météo‑France and Deutscher Wetterdienst. Research‑driven enhancements were supported by Swiss institutions including ETH Zurich, University of Bern, and the Paul Scherrer Institute, and by participation in European initiatives like the EUMETNET composite radar programs. Ongoing modernization addresses climate resilience and interoperability with international observing systems such as the Global Observing System.

Category:Weather radars Category:Science and technology in Switzerland