An air mass boundary where a low moisture air mass meets a high moisture air mass is called a dry line. It is fundamental in meteorology.
What is a dry line?
A dry line is a transect line capable of splitting (dividing) the moist (atmospheric) air and dry air.
The dry line can also be defined as a roughly real boundary between two different masses of air (humid and dry).
The dry line can be used to schematize how is the movement of the most and dry air masses in a front.
Learn more about air masses here:
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