New research finds that as turboprop and jet aircraft climb or descend under certain atmospheric conditions, they can inadvertently seed mid-level clouds and cause narrow bands of snow or rain to develop. The lead author of the study is National Center for Atmospheric Research (NCAR) scientist An... Show moreNew research finds that as turboprop and jet aircraft climb or descend under certain atmospheric conditions, they can inadvertently seed mid-level clouds and cause narrow bands of snow or rain to develop. The lead author of the study is National Center for Atmospheric Research (NCAR) scientist Andrew Heymsfield. Show less