Plain English Meaning
A short code in a weather report meaning 'towering cumulus' — tall, fast-growing puffy clouds that show the air is unstable and storms may be developing.
Full Definition
A remarks-section contraction used in aviation weather reports (such as METARs and pilot reports) to indicate the presence of towering cumulus clouds — tall, rapidly building cumulus clouds with strong vertical development that often signal unstable air and the potential for thunderstorm formation.
Context Anchor
Seen in PIREPs, where each slash code labels a different part of the pilot’s weather report.