Air Masses and Fronts

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The area where two air masses meet but do not mix.

Cold and warm air masses that meet but don't move each other, causing a standoff. Can bring many days of clouds and precipitation.

A warm, humid air mass that forms over oceans near the tropics. Brings hot humid weather in the summer and heavy rain and snow in the winter.

A cool, humid air mass that forms over icy cold North Pacific and North Atlantic oceans.

A large body of air that has similiar temperature, humidity and air pressure

When a warm air mass is caught between two cooler air masses. This causes the cool air masses to mix and bring cooler ground temperatures as well as clouds, rain or snow.

Fast warm air masses collides with a slow cold air mass, moving overtop of the cold. Brings clouds, storms, and rain.

Cool, dry air masses that form over central and northern Canada and Alaska. Can bring storms in the summer.