![NLDN](https://www.unidata.ucar.edu/blog_content/images/2013/20130423_vaisala_lightning.jpg)
Vaisala's National Lightning Detection Network (NLDN) began operation in 1983 as a regional network run by the State University of New York at Albany. Since then, the network has expanded to monitor cloud-to-ground lightning activity across the continental United States, 24 hours a day, 365 days a year.
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