What can be a result of a close temperature and dew point reading?

When the temperature and dew point readings are close to each other, it indicates that the air is nearing saturation. This proximity suggests that the moisture content in the air is high, which can lead to the formation of fog. Fog forms when the temperature drops to the dew point, causing the water vapor in the air to condense into tiny water droplets suspended in the air near the ground. This phenomenon typically occurs under calm conditions when the air is cooled, often during the night or early morning when temperatures drop.

The other options do not directly correlate with the implications of a close temperature and dew point reading. Increased wind speed and clear skies are generally associated with different atmospheric conditions. Thunderstorms, while sometimes related to high humidity, are typically linked to significant instability and the presence of a lifting mechanism, which are not directly indicated by a simple close reading of temperature and dew point. Thus, formation of fog is the most accurate outcome of conditions signaled by closely aligned temperature and dew point values.