How can the temperature/dew point spread impact flight planning for nighttime operations?

A narrow temperature/dew point spread is significant in flight planning for nighttime operations because it suggests a higher likelihood for the formation of ground fog. During the night, when temperatures drop, the air may cool to its dew point, creating conditions conducive to fog. This is particularly critical for flight safety, as fog can severely reduce visibility on takeoff and landing.

Understanding this relationship helps pilots anticipate potential hazards. A narrow spread is a clear warning sign that low visibility conditions could develop due to fog formation, prompting pilots to adjust their flight plans accordingly, possibly delaying departures, altering arrival routes, or ensuring they have adequate procedures in place for low-visibility operations.

While other options may contain elements of truth, they do not convey the same direct impact on safety and operational planning that a narrow temperature/dew point spread does for nighttime operations.