<P> Tropical and equatorial air masses are hot as they develop over lower latitudes . Those that develop over land ( continental ) are drier and hotter than those that develop over oceans , and travel poleward on the western periphery of the subtropical ridge . Maritime tropical air masses are sometimes referred to as trade air masses . Monsoon air masses are moist and unstable . Superior air masses are dry , and rarely reach the ground . They normally reside over maritime tropical air masses , forming a warmer and drier layer over the more moderate moist air mass below , forming what is known as a trade wind inversion over the maritime tropical air mass . Continental Polar air masses ( cP ) are air masses that are cold and dry due to their continental source region . Continental polar air masses that affect North America form over interior Canada . Continental Tropical air masses ( cT ) are a type of tropical air produced by the subtropical ridge over large areas of land and typically originate from low - latitude deserts such as the Sahara Desert in northern Africa , which is the major source of these air masses . Other less important sources producing cT air masses are the Arabian Peninsula , the central arid / semi-arid part of Australia and deserts lying in the Southwestern United States . Continental tropical air masses are extremely hot and dry . </P>
<P> Tropical and equatorial air masses are hot as they develop over lower latitudes . Those that develop over land ( continental ) are drier and hotter than those that develop over oceans , and travel poleward on the western periphery of the subtropical ridge . Maritime tropical air masses are sometimes referred to as trade air masses . Monsoon air masses are moist and unstable . Superior air masses are dry , and rarely reach the ground . They normally reside over maritime tropical air masses , forming a warmer and drier layer over the more moderate moist air mass below , forming what is known as a trade wind inversion over the maritime tropical air mass . Continental Polar air masses ( cP ) are air masses that are cold and dry due to their continental source region . Continental polar air masses that affect North America form over interior Canada . Continental Tropical air masses ( cT ) are a type of tropical air produced by the subtropical ridge over large areas of land and typically originate from low - latitude deserts such as the Sahara Desert in northern Africa , which is the major source of these air masses . Other less important sources producing cT air masses are the Arabian Peninsula , the central arid / semi-arid part of Australia and deserts lying in the Southwestern United States . Continental tropical air masses are extremely hot and dry . </P>
which type of air masses are associated with dry cool weather
which type of air masses are associated with dry cool weather
Continental Polar
Continental Polar