UN Agencies Warn: Spectrum Interference Is Putting Early Warning Systems and Climate Science at Risk

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Spectrum congestion isn't just an amateur radio problem — it's now a public safety one, according to two of the United Nations' leading technical agencies.

The International Telecommunication Union (ITU) and the World Meteorological Organisation (WMO) have called on governments to introduce tougher protections against radio spectrum interference, warning that the same frequencies used to monitor climate, forecast weather, and deliver early warning messages are increasingly being crowded out by satellite and wireless systems.

The Warning From Geneva

At a meeting held in Geneva on 28th September, the two agencies said this growing spectrum interference increasingly threatens both the study of environmental dangers and the public response to them. These are the same frequencies used to monitor and collect data from the ocean, atmosphere, and land.

Doreen Bogdan-Martin, Secretary-General of the ITU, told the meeting that "preventing harmful radio interference is a matter of public safety and can save lives." The agencies warned that interference could seriously compromise the accuracy of measurements and data, and with it, the ability to prepare for environmental dangers before they strike.

A New Handbook — and Specific Bands at Risk

The appeal coincided with the release of a new handbook from the two agencies, titled "The Use of Radio Spectrum for Meteorology: Weather, Climate, Water and Related Environmental Applications," offering guidance on using and protecting radio frequencies for these purposes.

Among the specific concerns raised is the 24 GHz water vapour band, which plays a role in the UN's Early Warnings for All initiative — an effort already having to navigate these technical interference bottlenecks.

The Knock-On Effects

The agencies outlined several ways unchecked RFI is already causing harm:

  • Degraded data quality — Interference creates "blind spots" and added noise, corrupting the measurements that feed Numerical Weather Prediction (NWP) models.

  • Compromised life-saving alerts — Lower-quality data directly weakens the reliability of early warnings for fast-moving disasters like tropical cyclones, flash floods, and severe storms.

  • Disrupted climate science — Long-term metrics, particularly Sea Surface Temperature (SST) measurements and space weather monitoring, face serious blind spots as commercial spectrum bids encroach further on these bands.

It's a reminder that spectrum pressure isn't confined to amateur bands — the squeeze on RF real estate is now a genuine factor in how quickly the world can see a disaster coming.