Thermals tend to be indicated with the presence of obvious isolated cumulus clouds at the top in the thermal. Cumulus clouds are formed through the soaring air within a thermal because it ascends and cools, until the water vapor within the air starts to condense into seen droplets. " https://thermal-cycling-chambers67901.blog2learn.com/83356283/the-definitive-guide-to-localized-thermal-test-systems