What conditions refer to IMC in aviation?

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Instrument meteorological conditions (IMC) refer to weather conditions in which pilots are required to fly using instruments rather than visual references outside the cockpit. IMC typically includes situations where visibility is below certain thresholds, such as when it is too cloudy, foggy, rainy, or snowing, making it challenging or impossible to navigate solely by sight.

In aviation, pilots must be trained and certified to fly in IMC, as this requires proficiency in using instruments to determine their aircraft's orientation and navigation. IMC can present significant challenges and increased risks, which is why specific training and adherence to regulations are crucial for safety in these conditions.

The other options do not pertain to the context of aviation weather conditions. Visual meteorological conditions (VMC) are the opposite of IMC and describe weather circumstances where pilots can fly visually. Internal military conditions and intermittent meteorological checks are not recognized terms used in aviation meteorology.

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