Air Masses

Depending on whether the airmasses develop over land or ocean, they are divided into two main groups: continental and maritime. Each of these have sub-categories depending on whether the airmasses originate from arctic, polar, or tropical.

Image result for continental air mass
Image result for 5 air masses that affect the us

The Superstorm of 1993 had a collision of 3 airmasses, continental arctic, continental polar, and maritime tropical.

Image result for superstorm 93 air masses