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en.wikipedia.org/wiki/Air_mass

In meteorology, an air mass is a volume of air defined by its temperature and water vapor ... For instance, an air mass originating over the desert southwest of the United ... For example, a series of fronts over the Pacific might show an air mass ... Polar air over the ocean (maritime) loses its stability as it gains moisture over ...

www.theweatherprediction.com/basic/airmass

In the winter this air mass is shoved toward the equator but in summer it can ... The source region for mP air is over cold ocean currents or high latitude ocean waters. ... Since mP air is always near saturation, orographic lifting of the air mass can ... Once cP air modifies significantly it no longer makes sense to label it Polar air ...

www.thoughtco.com/types-of-north-american-air-masses-3443886

Dec 2, 2016 ... Learn more about these air mass types and where they come from ... An air mass is not only large (it can be thousands of miles across and ... It forms at low latitudes, generally within 25° of the equator. ... Those affecting the U.S. originate over the North Pacific Ocean and ... Icebergs near Greenland - Arctic.

scied.ucar.edu/shortcontent/air-masses

Air masses that form near the equator or in the tropics (equatorial or tropical air ... polar air mass moves into warmer areas and over the ocean the air will warm ...

www.nationalgeographic.org/encyclopedia/air-mass

Mar 30, 2011 ... Air masses can extend thousands of kilometers in any direction, and can reach ... Equatorial air masses develop near the Equator, and are warm. ... Indian Ocean is called a maritime tropical air mass and is warm and humid.

www.met.tamu.edu/class/atmo202/Dir-surface/surface-stu.html

These air masses form north of (or very near) the Arctic Circle and poleward. ... The source region for these air masses are the northern Pacific and the ... Along the northeastern part of the United States, maritime polar air can enter the United ... Continental Tropical : These are the hot, dry air masses which originate over ...

cimss.ssec.wisc.edu/wxwise/class/frntmass.html

Source Regions are simply geographic areas where an air mass originates. ... 25 degrees of the equator; continental c - located over large land masses--dry ... We can then make combinations of the above to describe various types of air masses . ... mT -- wintertime source for the SW US is the subtropical East Pacific Ocean.

www.shsu.edu/~dl_www/bkonline/131online/13102match/OnLineState2.htm

The divergence near the ground that is associated with the subtropical high pressure ... The cP air mass in North America originates in Siberia ... If the air temperature at the surface is 40 degrees F, what would be the ..... The northern Pacific Ocean area in North America is most likely to be a source of maritime tropical air ...

www.nhc.noaa.gov/marine/docs/USA_Glossary.pdf

discontinuity ahead of a cooler/drier air mass. ... The dryline does not have to be the ... north of the Equator west of the International Dateline. Labeled as TYPH, HURCN, or ... focus for tropical cyclogenesis in the northwest Pacific ocean, and ... A second type of subtropical cyclone is a mesoscale low originating in or near a.

ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/af/arms/trp.rxml

Maritime tropical air masses originate over the warm waters of the tropics and Gulf of Mexico, where heat and moisture are transferred to the overlying air from ...