Balance
Senior Member.
https://digital.nmla.metoffice.gov.uk/
http://library.metoffice.gov.uk/M10326UK/OPAC/Search/AdvancedSearch.aspx
On a related search of Met Office data for contrails the first hit found a 1953 paper with a photo of a contrail and of a distrail. I don't know if it's already been covered but thought the site worth highlighting for the rich content it holds and those willing to invest time in scouring it.
http://library.metoffice.gov.uk/M10326UK/OPAC/Search/AdvancedSearch.aspx
On a related search of Met Office data for contrails the first hit found a 1953 paper with a photo of a contrail and of a distrail. I don't know if it's already been covered but thought the site worth highlighting for the rich content it holds and those willing to invest time in scouring it.