Body of air with a similar temperature and moisture content

Air mass formed over land

Air mass formed over water

Air mass formed over a cold/cool region

Air mass formed over a hot/warm region

Mass of dry cooler air that pushes down and brings good weather.

mass of warmer moist rising air that brings storms

when one air mass meets another air mass.

cold air mass is replacing a warm air mass - decreasing temperatures

moving mass of warmer air - often means rain

warm air mass and cool air mass hit one another

warm air mass is in the middle of two cold air masses

Forms when a large amount of warm moist air rises and condenses. Mainly from cumulonimbus clouds.

Formed in a low pressure system and rotates because of the Coriolis effect. Gets stronger with heat.

Forms when warm air collides with cold air. The cold air pushes over the warm while a column of the warm air breaks through.

The amount of water vapor in the atmosphere

force exerted on a surface by the air above it as gravity pulls it down