pl23_wea03672.jpg
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https://www.noaa.gov/media/digital-library-photo/pl23wea03672jpgDescription
Weather Service Bulletin No. 8, 1949. P. 21. Cloud base and topradar indicator developed allowing cloud heights to be determined directly abovethe observer.
Credit
Headquarters Air Weather Service; Courtesy of the family of Nels Johnson, United States Weather Bureau (dec.)
Collection
Weather Service