What does "LTG OCNL" indicate?

The indication "LTG OCNL" in a METAR report signifies that occasional lightning has been observed. This terminology is used in aviation weather reports to communicate the frequency and intensity of lightning activity. "OCNL" stands for "occasional," suggesting that instances of lightning are not constant but occur intermittently.

In the context of aviation, knowing the level of lightning activity is crucial for flight safety and planning. Occasional lightning suggests that while there may be periods with lightning present, it is not continuous or frequent, allowing pilots to gauge the potential hazards during flight operations. Understanding this distinction helps ensure informed decision-making in flight management and enhances overall safety.