What can be expected when the temperature and dew point are close together?

When the temperature and dew point are close together, it indicates that the air is nearly saturated with moisture. This proximity often leads to the formation of fog, especially if the temperature falls to or below the dew point. Fog typically forms when water vapor condenses into tiny droplets that are suspended in the air, reducing visibility. This occurs when the atmosphere cools to the dew point at ground level or when moisture is added to the air, such as through evaporation. Thus, the correct answer highlights the association between close temperature and dew point readings with fog formation, which is a common meteorological phenomenon. Good visibility is generally observed when there is a significant difference between temperature and dew point. Increased turbulence is usually associated with varying atmospheric conditions, and reductions in cloud cover are also linked to different weather patterns, rather than the close proximity of temperature and dew point.