When a large body the air continues to be over one area for number of days or weeks, the body ofair may adjust its thermal and moisture properties according to the floor or water underit. The air exchanges warmth with the land or water, either warming or cooling, until itstemperature carefully matches the of the surface below it. The body of air also gains orloses moisture relying on the temperature and also moisture contents of the surface. A body ofair that resembles the qualities of the surface ar under the is dubbed an airmass.

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Five simple types of wait masses affect Michigan"s weather. Castle can bring anything fromscorching warmth to bone-chilling cold depending upon the form of air mass. The 5 are. Continental Arctic (cA): very cold temperatures and also verylittle moisture. These usually originate north of the Arctic Circle,where work of 24 hour darkness enable the air come cool to occasionally record-breaking lowtemperatures. Such air masses regularly plunge southward across Canada and also the USA duringwinter, but very rarely form during the summer because the sun warms the Arctic. Continental polar (cP): Cold and also dry, however not as cold asArctic air masses. These usually form farther to the south and also oftendominate the weather snapshot across the USA throughout winter. Continent polar masses doform during the summer, yet usuallyinfluence only the north USA. These air masses room the persons responsible because that bringingclear and pleasant weather during thesummer come the North. Maritime polar (mP): Cool and also moist. They usually bringcloudy, damp weather to the USA. Marine polar waiting masses form over the northern Atlanticand the north Pacific oceans. Castle most frequently influence the Pacific Northwest and theNortheast. Maritime polar wait masses can kind any time of the year and also are usually not ascold as continental polar waiting masses. Naval tropical (mT): warm temperatures with copiousmoisture. Marine tropical air masses room most common acrossthe east USA and originate end the warmth waters of the southerly Atlantic Ocean and also theGulf that Mexico. This airmasses can form year round, however they are many prevalent across the USA throughout summer.Maritime tropical wait masses areresponsible because that the hot, humid days of summer across the South and also the East. Continent Tropical (cT): hot and an extremely dry. Castle usuallyform end the Desert Southwest and also northern Mexico throughout summer. Lock can lug recordheat to the Plains and also the Mississippi Valley during summer, however they usually perform not makeit to the East and the Southeast. Together they relocate eastward, humidity evaporates right into the air,making the waiting mass an ext like a naval tropical air mass. Continent tropical airmasses very rarely kind during winter, however they usually keep the Desert Southwestscorching above 100 degrees Fahrenheit throughout summer.

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