What does "MIFG" stand for in aviation weather reporting?

"MIFG" stands for shallow fog in aviation weather reporting. This term is used specifically to describe a significant weather phenomenon where fog forms close to the ground but does not obscure visibility to the extent of typical fog conditions. Shallow fog typically presents a visibility of less than 5/8 mile, and it can occur under specific atmospheric conditions, often in the evening or early morning hours.

Understanding this term is crucial for pilots and dispatchers, as shallow fog can affect aviation operations by impairing visibility while still potentially allowing for safe flying conditions under certain circumstances. Recognizing weather phenomena like MIFG ensures that flight planning can take into account potential visibility issues and helps in making informed decisions regarding aircraft operations and safety precautions.

The other terms mentioned in the answer choices do not align with the standard aviation definitions, as they either refer to fog types that have different meanings or are not commonly used within aviation weather reporting.