Why will there be sub-freezing temperatures Saturday morning?

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BRIDGEPORT, W. Va. (WDTV) - High pressure means that air is sinking. Sinking air often leads to clear skies. That will be the case Friday night.

The air is cold to begin with and will get colder after sunset. In addition, the air is dry and that allows temperatures to fall even farther. The reason is that humidity gives off heat to the surrounding air as it cools. The less humidity, the less heat is given off. Translation: Dry air cools faster at night than humid air does.