What are fronts?

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by Evan Stewart

WVEC.com

Posted on March 9, 2010 at 5:06 PM

Updated Tuesday, May 31 at 3:42 PM

A front is an area where two air masses of different temperature and humidity meet. Fronts usually bring bad weather.

A cold front is the boundary between warm air and cool air, where the cool air is replacing the warm air.

A warm front is the boundary between cool air and warm air, where the warm air is replacing the cool air.

When neither air mass is replacing the other, a stationary front forms.

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