The top of the stable layer is the frontal surface. Below the stable layer lies the colder air mass. The base of the stable layer is the cold side of the transition zone. However, a true inversion need not be present. This feature is commonly called a frontal inversion. The stable region could have a negative, isothermal or weak positive lapse rate. The region depicted on a Skew-T sounding which corresponds to the transition zone is called the stable layer. The frontal trough is most distinct at low levels. Troughing in the contours or isobars which is coincident with the frontal surface is known as a frontal trough. Frontal surfaces, mountains and transition zones themselves can serve as boundaries between air masses. The term “front,” by itself, generally refers to a surface front.Ī frontal surface aloft is known as the upper front.Ī boundary is some feature which separates two air masses. The surface front is the intersection of the frontal surface and the ground.
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