Tempeture and moisture charactehtics

As we have learned, air masses are classified according to their source regions. Source regions may have one of four temperature attributes: equatorial, tropical, polar or arctic.
In terms of moisture characteristics they can be either continental or maritime. On a weather map moisture characteristics are abbreviated “c” for continental or “m” for maritime;
temperature attributes are abbreviated “E” for Equatorial, “T” for Tropical, “P” for Polar and “A” for Arctic. For example a tropical air mass that formed over a continent is labeled “cT” and a tropical air mass that formed over the oceans is labeled “mT”.