• When two air masses meet, the result is often a storm.
  • A cold front forms when a cold air mass runs into a warm air mass.
  • Cold fronts often bring sudden changes in the weather.
  • An occluded front has three air masses: cold, warm, and cold.
  • The differences in temperature and pressure cause clouds and precipitation.
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  • The post was originally published on March 31, 2013.
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