Cold air can replace warm air {cold front}|, or cold-air masses can move into regions. Cold fronts bring rolling dark clouds and lightning, moving fast and steep, as cold air tunnels under warm air, with hard rain. Cold fronts first make cumulonimbus clouds and later make dark low clouds and small strong storms. Cold fronts can make squall lines, from which can come tornados.
Physical Sciences>Earth Science>Atmosphere>Wind>Front
5-Earth Science-Atmosphere-Wind-Front
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Date Modified: 2022.0224