Thermals in many cases are indicated via the existence of visible isolated cumulus clouds at the top in the thermal. Cumulus clouds are formed through the soaring air in a thermal as it ascends and cools, till the water vapor inside the air begins to condense into noticeable droplets. https://thermal-shock-testing-app89012.tokka-blog.com/36006199/the-definitive-guide-to-localized-thermal-test-systems