What does the abbreviation "LTG" represent in a weather report?

The abbreviation "LTG" in a weather report specifically represents "lightning." This term is commonly used in METAR and TAF reports to indicate the occurrence of lightning in the vicinity of the reporting station. Lightning can be associated with thunderstorms and is an important weather phenomenon to monitor, especially for aviation safety and operations. Understanding meteorological abbreviations like "LTG" is essential for interpreting weather data accurately, especially during flight planning and in-flight procedures.

The other options, while related to weather, refer to different phenomena. Heavy fog often would be indicated differently, and light snow would have its own specific terminology. Low temperature is also distinctly expressed in METAR reports with temperature readings, not through an abbreviation like "LTG."