What weather feature is indicated by "TCU NE-SE" in a PIREP?

The notation "TCU" in a PIREP stands for "towering cumulus," which refers to a type of cumulus cloud that has significant vertical development and can be indicative of instability in the atmosphere, potentially leading to thunderstorms. The "NE-SE" indicates the location of these clouds, specifically that they are present in the northeastern to southeastern part of the observed area.

Understanding this notation is crucial for pilots and air traffic controllers as towering cumulus clouds can signal the potential for severe weather, including thunderstorms, which can impact flight safety. The correct identification helps in making informed decisions regarding flight paths and weather conditions.