Vaisala Wins WMO Radiosonde Intercomparison

Vaisala Radiosonde RS92 was proven to be the world's top radiosonde as it was placed number one in the 8th World Meteorological Organization (WMO) Intercomparison of Radiosonde Systems. The WMO published their final report on the measurement results on Friday May 13th, 2011 on their website.

The results show that Vaisala's sounding system is the world's best-performing combination for upper-air in-situ observations, and provides the highest accuracy of data for a wide range of meteorological applications, such as numerical weather prediction models, climatology, and synoptic meteorology. The Vaisala Radiosonde RS92-SGP - operated together with the Vaisala DigiCORA® Sounding System MW31 - achieved nearly perfect scores in all the measurement parameters, meeting and even exceeding international observation network requirements.

The RS92-SGP performed very well in both temperature and humidity measurements, being highly consistent and maintaining its level of performance also in demanding conditions. For an example, the RS92 was the only radiosonde in the Intercomparison that incorporates working protection against evaporative cooling, an effect that can distort the temperature measurement due to accumulated water evaporating and cooling the sensor.

The WMO Intercomparison is organized every 4-5 years. It is a continuous four-week sounding campaign, designed to be an objective venue for assessing the qualities and performance of different radiosonde systems. The 8th Intercomparison was held last July in Yangjiang, China. Eleven radiosonde manufacturers participated, making it the largest measurement campaign in the history of modern radiosonde intercomparisons.

The WMO final report is available online at

More information

Johanna Lentonen, Product Area Manager

Tel. +358 9 8949 2559, email johanna.lentonen[at]

About Vaisala

Vaisala is a global leader in environmental and industrial measurement. Building on 75 years of experience, Vaisala contributes to a better quality of life by providing a comprehensive range of innovative observation and measurement products and services for meteorology, weather critical operations and controlled environments. Headquartered in Finland, Vaisala employs approximately 1350 professionals worldwide and is listed on the NASDAQ OMX Helsinki.

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