How is lightning occurring at a frequency of about 4 flashes per minute between the clouds and the ground reported in a METAR?

The occurrence of lightning at a frequency of about 4 flashes per minute between the clouds and the ground is reported in a METAR as "FRQ LTGCG." This terminology indicates that lightning is frequent and specifically identifies the type of lightning being observed. The “FRQ” prefix signifies a high frequency, which aligns with the reported rate of 4 flashes per minute, suggesting a substantial and ongoing electrical activity in the area. Moreover, the “LTGCG” suffix denotes that the lightning is occurring between clouds and the ground, which is the specific phenomenon being observed.

Understanding the context behind the other choices helps clarify why "FRQ LTGCG" is the most appropriate answer. For instance, "OCNL LTG" would indicate occasional lightning, which does not accurately represent the higher frequency reported. "SCT LTG" refers to scattered lightning, implying a less concentrated occurrence, and "LTG VC" means lightning is occurring in the vicinity, but it does not convey the frequency or the specific cloud-to-ground nature of the strikes. Thus, "FRQ LTGCG" is the precise report capturing the frequency and type of lightning activity.