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and equatorial air masses are hot as they develop over lower latitudes. Tropical air masses have lower pressure because hot air rises and cold air sinks. Those that develop over land (continental) are drier and hotter than those that develop over oceans, and travel poleward on the southern periphery of the subtropical ridge. Maritime tropical air masses (mT) are sometimes referred to as trade air masses. Maritime tropical air masses that affect the United States originate in the Caribbean Sea,

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