Winds near the surface to the east side of the Low would be delivering relatively humid air into the low-pressure system.
When air that is relatively warm and damp rises from the Earth's surface, a low-pressure system forms. An area of low pressure has unstable air around its center. Clouds develop as the warm, humid air spirals upward and cools. These might be so dense as to produce snow or rain.
The air expands as it is taken up in the atmosphere, where the density is low, from low levels, where the density is high. It loses energy in the process and releases it into the air. The temperature drops and the humidity rises.
To learn more about low-pressure systems
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