Front
The boundary of an advancing mass of warm air, in particular the leading edge of the warm sector of a low-pressure system
Warm Front
Pellets of frozen rain which fall in showers from cumulonimbus clouds
Hail
The process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material
Conduction
The lowest region of the atmosphere, extending from the earth's surface to a height of about 3.7–6.2 miles (6–10 km), which is the lower boundary of the stratosphere
Troposphere
The boundary of an advancing mass of cold air, in particular the trailing edge of the warm sector of a low-pressure system
Cold front
A mobile, destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud and advancing beneath a large storm system
Tornado
The movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat
convection
The regions of the surface, atmosphere, and hydrosphere of the earth (or analogous parts of other planets) occupied by living organisms
Biosphere
A composite front produced by occlusion
Occluded Front
A storm with a violent wind, in particular a tropical cyclone in the Caribbean
Hurricane
The emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization
Radiation
The layer of the earth's atmosphere above the troposphere, extending to about 32 miles (50 km) above the earth's surface (the lower boundary of the mesosphere)
Stratosphere
Stationary Front
Stability
The envelope of gases surrounding the earth or another planet
The conversion of one form of energy into another, or the movement of energy from one place to another
Energy transfer
The force exerted on a surface by the air above it as gravity pulls it to Earth
Air pressure