Which of the following is NOT considered a frontal discontinuity?

The concept of frontal discontinuities pertains to the boundaries between different air masses, which are characterized by distinct temperature, pressure, and moisture characteristics. These discontinuities are essential for understanding weather patterns and phenomena.

Temperature, pressure, and moisture content (or dew point) are all properties that can vary significantly across a front. For instance, a cold front marks a boundary where colder air replaces warmer air, leading to noticeable changes in temperature. Similarly, pressure often decreases as a front approaches and can vary sharply between different air masses. Moisture content or dew point is also a crucial indicator, as it can dramatically change across a front, signaling different humidity levels in the air masses on either side.

Humidity, while closely related to moisture content and dew point, refers specifically to the amount of water vapor present in the air and is often considered in a more generalized sense. In this case, it does not denote a clear boundary as the others do. Therefore, in the context of frontal analysis, humidity is not typically classified as a distinct discontinuity.

Recognizing these properties helps to understand the dynamics of weather fronts and their impact on local weather conditions.