Certified Flight Instructor (CFI) Practice Exam

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What does "MI" mean in METAR terminology?

Shallow
Mist Intervals
Minor Increments
Multiple Instances

The correct answer is: Shallow

In METAR terminology, "MI" signifies "Shallow," specifically referring to a certain type of atmospheric condition. When used in meteorological reports, it describes layers of mist that are characterized by limited visibility, typically not obscuring the surface significantly. This distinction is essential for pilots and air traffic controllers, as it helps in assessing flight conditions and visibility on approach or takeoff. Understanding the significance of "MI" contributes to a pilot's situational awareness regarding weather conditions that may impact flight safety. It indicates a lesser severity compared to other visibility-reducing conditions like fog or heavy mist, which are denoted differently. This specific nomenclature is crucial for making informed decisions during flight operations.