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The CEI online application that allows access to the data of CERAUNIC DENSITY* of the Italian territory.

  • based on data from over 10 years of observations
  • high spatial and temporal precision
  • usable 24 hours a day
* average number of lightning strikes and the average number of points of impact on the ground, both per year per km2
mappa italiana densità ceraunica

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How ProDiS works

Try the application for free and find out how much it is; simple to obtain the 'Ng' value with cei prodis

Do you have any doubts? Consult the faq

frequently asked questions (FAQ)

CEI ProDis™ is the online CEI application that allows access to the ceraunic density data of the Italian territory.

This information (indicated with the symbol Ng) represents the average number of lightning strikes on the ground per year per Km2 calculated using a grid with square cells of a side equal to 5 km.

CEI ProDis™ constitutes a remarkable innovation in the field of lightning damage prevention as it provides a value of Ng based on lightning data detected in over ten years of observations on the whole Italian territory with a  high spatial and temporal precision  (identification of the place and the instant in which each single lightning bolt occurred).

Logo METEORAGEThe data was acquired through the Italian Lightning Detection System owned by METEORAGE

The network, with national coverage, was installed in 1994 applying the  best detection technology available to date .
This approach, based on international scientific research over the last twenty years, is the one applied in numerous systems throughout Europe and around the world.

The MÉTÉORAGE network guarantees the real-time detection and accurate spatial localization of all discharges developed between cloud and ground.
The high efficiency of the system and the  continuous operation 24 hours a day make it possible to have a homogeneous, precise, reliable database for the calculation of Ng.

For the CEI ProDiS™ application the content of the CEI EN IEC 62858 Standard "Lightning density based on lightning location systems - General principles".


Data sample used

For the generation of the database that is the basis of CEI ProDiS, the data of "flash" (that is, only the main branch of a lightning bolt was taken into consideration), for consistency with what is commonly used in international reference studies and standards.

The survey period goes from the year 2014 to 2023 inclusive, for a total of ten years of measurements. Cloud-cloud phenomena that are not significant for the design of the protection systems were excluded from the calculation.

The data collected were corrected to take into account the efficiency of the detection network, so as not to introduce distortions of the real meteorological behavior.